Help, formulas/goal seeking

N

NNO123

New Member
Joined
Dec 29, 2017
Messages
4
Hi guys, I have this problem and cannot solve. So I was hoping on some help.
I can solve this problem with goal seeking, but this is not dynamic. Maybe you have a better solution.

So I have the following:

[TABLE="width: 500"]
<tbody>[TR]
[TD][TABLE="width: 86"]
<tbody>[TR]
[TD="width: 86"]Total budget[/TD]
[/TR]
</tbody>[/TABLE]
[/TD]
[TD][TABLE="width: 84"]
<tbody>[TR]
[TD="width: 84"]campaign1[/TD]
[/TR]
</tbody>[/TABLE]
[/TD]
[TD][TABLE="width: 84"]
<tbody>[TR]
[TD="width: 84"]campaign2[/TD]
[/TR]
</tbody>[/TABLE]
[/TD]
[TD][TABLE="width: 220"]
<tbody>[TR]
[TD="width: 220"]total spend[/TD]
[/TR]
</tbody>[/TABLE]
[/TD]
[TD][TABLE="width: 130"]
<tbody>[TR]
[TD="width: 130"]Fee on campain1[/TD]
[/TR]
</tbody>[/TABLE]
[/TD]
[TD][TABLE="width: 95"]
<tbody>[TR]
[TD="width: 95"]total fee[/TD]
[/TR]
</tbody>[/TABLE]
[/TD]
[TD][TABLE="width: 80"]
<tbody>[TR]
[TD="width: 80"]Fixed cost 1[/TD]
[/TR]
</tbody>[/TABLE]
[/TD]
[TD][TABLE="width: 94"]
<tbody>[TR]
[TD="width: 94"]Fixed cost 2[/TD]
[/TR]
</tbody>[/TABLE]
[/TD]
[/TR]
[TR]
[TD]100 USD[/TD]
[TD][TABLE="width: 84"]
<tbody>[TR]
[TD="class: xl65, width: 84"]unknown[/TD]
[/TR]
</tbody>[/TABLE]
[/TD]
[TD][TABLE="width: 84"]
<tbody>[TR]
[TD="class: xl65, width: 84"]unknown[/TD]
[/TR]
</tbody>[/TABLE]
[/TD]
[TD][TABLE="width: 84"]
<tbody>[TR]
[TD="class: xl65, width: 84"]unknown (campaign1+campain2)[/TD]
[/TR]
</tbody>[/TABLE]
[/TD]
[TD][TABLE="width: 84"]
<tbody>[TR]
[TD="class: xl65, width: 84"]unknown[/TD]
[/TR]
</tbody>[/TABLE]
(2%*campaign1)[/TD]
[TD][TABLE="width: 84"]
<tbody>[TR]
[TD="class: xl65, width: 84"]unknown[/TD]
[/TR]
</tbody>[/TABLE]
(2,5%*total spend)[/TD]
[TD]10USD[/TD]
[TD]10USD[/TD]
[/TR]
</tbody>[/TABLE]
[TABLE="width: 873"]
<tbody>[TR]
[TD][/TD]
[/TR]
</tbody>[/TABLE]

So I know, that the allocation between the two campaigns is 50%/50%. I know that I have 2% fee on campaign 1 and a total fee of 2,5%.

So The problem is to find the amount I can spend on campaign 1 and 2, and then I can calculate the rest. So do you think this can be done by formulas? I can solve this by using goal seeker, but this is not an dynamic solution for me, because I keep changing the fee percentages and the total budget.

In goal seek I will do:


[TABLE="width: 500"]
<tbody>[TR]
[TD][TABLE="width: 86"]
<tbody>[TR]
[TD="width: 86"]Total budget[/TD]
[/TR]
</tbody>[/TABLE]
[/TD]
[TD][TABLE="width: 84"]
<tbody>[TR]
[TD="width: 84"]campaign1[/TD]
[/TR]
</tbody>[/TABLE]
[/TD]
[TD][TABLE="width: 84"]
<tbody>[TR]
[TD="width: 84"]campaign2[/TD]
[/TR]
</tbody>[/TABLE]
[/TD]
[TD][TABLE="width: 220"]
<tbody>[TR]
[TD="width: 220"]total spend[/TD]
[/TR]
</tbody>[/TABLE]
[/TD]
[TD][TABLE="width: 130"]
<tbody>[TR]
[TD="width: 130"]Fee on campain1[/TD]
[/TR]
</tbody>[/TABLE]
[/TD]
[TD][TABLE="width: 95"]
<tbody>[TR]
[TD="width: 95"]total fee[/TD]
[/TR]
</tbody>[/TABLE]
[/TD]
[TD][TABLE="width: 80"]
<tbody>[TR]
[TD="width: 80"]Fixed cost 1[/TD]
[/TR]
</tbody>[/TABLE]
[/TD]
[TD][TABLE="width: 94"]
<tbody>[TR]
[TD="width: 94"]Fixed cost 2[/TD]
[/TR]
</tbody>[/TABLE]
[/TD]
[/TR]
[TR]
[TD]100 USD[/TD]
[TD]=50%*total spend[/TD]
[TD]=50%*total spend[/TD]
[TD][TABLE="width: 84"]
<tbody>[TR]
[TD="class: xl65, width: 84"]Put random number here[/TD]
[/TR]
</tbody>[/TABLE]
[/TD]
[TD]=campaign 1*2%[/TD]
[TD][TABLE="width: 84"]
<tbody>[TR]
[TD="class: xl65, width: 84"]=total spend*2%[/TD]
[/TR]
</tbody>[/TABLE]
[/TD]
[TD]10USD[/TD]
[TD]10USD

[/TD]
[/TR]
</tbody>[/TABLE]

Make a cell (called COST) = campaign 1+campaign2+fee on campain 1+total fee+fixed 1 + fixed 2

In goal seeker, I set my "COST" to 100 by changing "total spend".

now I will have the numbers:
campaign 1 = 38,64
Campaign 2 = 38,64
Total spend = 77,29
fee on campaign 1 = 0,77
total fee = 1,93

So everything macth. But How can I do this by formulas?? I dont think it is a difficult equation, but cannot solve it :)
any ideas? I dont mind using goal seeker, but I need it to be bore dynamic (automatically calculating if I change the percentages or my budget).

Thanks,
 

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It's just a little algebra:

ABCDEFGHI
Total BudgetCampaign1Campaign2Total SpentCampaign1 feeTotal FeeFixed cost 1Fixed cost 2
Calculated:
Cost

<colgroup><col style="width: 25pxpx"><col><col><col><col><col><col><col><col><col></colgroup><thead>
</thead><tbody>
[TD="align: center"]1[/TD]

[TD="align: right"][/TD]

[TD="align: center"]2[/TD]
[TD="align: right"]100[/TD]
[TD="align: right"]38.647343[/TD]
[TD="align: right"]38.647343[/TD]
[TD="align: right"]77.294686[/TD]
[TD="align: right"][/TD]
[TD="align: right"]0.77294686[/TD]
[TD="align: right"]1.93236715[/TD]
[TD="align: right"]10[/TD]
[TD="align: right"]10[/TD]

[TD="align: center"]3[/TD]
[TD="align: right"][/TD]
[TD="align: right"][/TD]
[TD="align: right"][/TD]
[TD="align: right"][/TD]
[TD="align: right"][/TD]
[TD="align: right"]2%[/TD]
[TD="align: right"]2.50%[/TD]
[TD="align: right"][/TD]
[TD="align: right"][/TD]

[TD="align: center"]4[/TD]
[TD="align: right"][/TD]
[TD="align: right"][/TD]

[TD="align: right"]77.294686[/TD]
[TD="align: right"][/TD]
[TD="align: right"][/TD]
[TD="align: right"][/TD]
[TD="align: right"][/TD]
[TD="align: right"][/TD]

[TD="align: center"]5[/TD]

[TD="align: right"]100[/TD]
[TD="align: right"][/TD]
[TD="align: right"][/TD]
[TD="align: right"][/TD]
[TD="align: right"][/TD]
[TD="align: right"][/TD]
[TD="align: right"][/TD]
[TD="align: right"][/TD]

</tbody>
Sheet2​

[TABLE="width: 85%"]
<tbody>[TR]
[TD]Worksheet Formulas[TABLE="width: 100%"]
<thead>[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=DAE7F5]#DAE7F5[/URL] "]
[TH="width: 10px"]Cell[/TH]
[TH="align: left"]Formula[/TH]
[/TR]
</thead><tbody>[TR]
[TH="width: 10px, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=DAE7F5]#DAE7F5[/URL] "]D4[/TH]
[TD="align: left"]=(A2-H2-I2)/(1+F3/2+G3)[/TD]
[/TR]
</tbody>[/TABLE]
[/TD]
[/TR]
</tbody>[/TABLE]



Take the formula you have in your COST cell. Everything in it is either a constant or a function of Total Spent (D2). Express everything you can as a function of D2, then solve for D2. You'll get the formula in D4.

Hope this helps.
 
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