I am trying to figure out how to set up an excel calc to allow a user to enter a percentage or amount (see red text below) in adjacent cells to calculate a new value. If they enter a percent, it automatically calcs the amount and vis versa. It needs to be dynamic enough to go back and forth between the two values so if they try a percent but then want to switch to an amount they can do it without remembering to delete the value in the % or amount field.
[TABLE="width: 320"]
<tbody>[TR]
[TD="width: 64"][/TD]
[TD="width: 64"]Old[/TD]
[TD="width: 64"]%[/TD]
[TD="width: 64"]Amt[/TD]
[TD="width: 64"]New[/TD]
[/TR]
[TR]
[TD][/TD]
[TD="align: right"]1000[/TD]
[TD="class: xl63, align: right"]10%[/TD]
[TD="class: xl64, align: right"]100[/TD]
[TD="align: right"]1100[/TD]
[/TR]
[TR]
[TD]or[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD][/TD]
[TD="align: right"]1000[/TD]
[TD="class: xl65, align: right"]10%[/TD]
[TD="align: right"]100[/TD]
[TD="align: right"]1100[/TD]
[/TR]
</tbody>[/TABLE]
[TABLE="width: 320"]
<tbody>[TR]
[TD="width: 64"][/TD]
[TD="width: 64"]Old[/TD]
[TD="width: 64"]%[/TD]
[TD="width: 64"]Amt[/TD]
[TD="width: 64"]New[/TD]
[/TR]
[TR]
[TD][/TD]
[TD="align: right"]1000[/TD]
[TD="class: xl63, align: right"]10%[/TD]
[TD="class: xl64, align: right"]100[/TD]
[TD="align: right"]1100[/TD]
[/TR]
[TR]
[TD]or[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD][/TD]
[TD="align: right"]1000[/TD]
[TD="class: xl65, align: right"]10%[/TD]
[TD="align: right"]100[/TD]
[TD="align: right"]1100[/TD]
[/TR]
</tbody>[/TABLE]