Question: I need help on creating an equation for the following (I am working on media math for selling ad time on radio) Multiply the gross

I need help on creating an equation for the following (I am working on media math for selling ad time on radio)

Multiply the gross amount by .15 to take out the agency discount

Then you take that number and multiple by .21

Here is an example: Gross is $100: 100x.15= 15 ; 100-15= 85; 85x.21= 17.85; 85-17.85 = 67.15

I need one excel formula to make that entire calculation. The amount 100 would be in a cell and the amount 21% would also be in a cell.

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