Excel 2010 In Pictures

16 Drag it to cell M4.

The worksheet should look like this:

By employing an absolute reference—using the $ symbol...

...the formula stays accurate for all months.

17 In cell B5 in the Revenue sheet, edit the formula...

...to make cell G6 in the Numbers Per-Frog sheet an absolute reference.

18 Use the Fill Handle to copy the formula in cell B5...

...so the Revenue sheet shows each month's net revenue.