Cashflow modelling

[duncanf]

I have two sheets - one with variable data split out by days:

[TABLE="width: 500"]
<tbody>[TR]
[TD]Day Number
[/TD]
[TD]1
[/TD]
[TD]2
[/TD]
[TD]3
[/TD]
[TD][/TD]
[TD]1
[/TD]
[TD]2
[/TD]
[TD]3
[/TD]
[/TR]
[TR]
[TD]Date
[/TD]
[TD]01/11/2017
[/TD]
[TD]02/11/2017
[/TD]
[TD]03/11/2017
[/TD]
[TD]etc etc
[/TD]
[TD]01/12/2017
[/TD]
[TD]02/12/2017
[/TD]
[TD]03/12/2018
[/TD]
[/TR]
[TR]
[TD]New Customers
[/TD]
[TD]1
[/TD]
[TD]5
[/TD]
[TD]10
[/TD]
[TD][/TD]
[TD]2
[/TD]
[TD]4
[/TD]
[TD]6
[/TD]
[/TR]
[TR]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
</tbody>[/TABLE]

Each new customer will pay by direct debit the same amount each month from the day they sign up. So in the table above, one customer will pay on 1st November, but on the 1st December 3 people will pay, on 2 November 5 people will pay, on 2 December 9 people will pay and so on....

On the separate sheet (cashflow), the layout across the top in terms of dates and day numbers are there, but I'm unsure of the formula to use to look up or how to approach it - all help welcome!

 

[duncanf]

Sorry, so I meant on the cashflow it would show each customer will pay £80, so 1st Nov we'd get £80, 1st Dec we'd get £240, for 2 Nov we'd get £400, 2nd Dec £720....

Also - the added difficulty of the 29/30/31st of each month and whether to just put roll these up to being received on 28th of each month...