Google docs help needed please

[panther4life]

Pie for anyone who can teach me step by step how to creat this formula in Google sheets. Cost will include 800 of fluff. For instance if cost says $1000(really $200 including the $800 of fluff) and sold for says $100 then profit loss should show a positive $100.

Or adversely if cost is $4000(really $3200) and under sold for is $5000 then I'd like it to show a loss or as -$1800.

I need this formula to be constant all the way down. Thanks and pie for any help!

 

 

[h0llywood]

If you show what the rows were, that would be a start. 

SUM=E(row)-F(row)