=(price-cost)/price
If you need to calculate a profit margin, you can easily do so with a simple formula that uses the sale price and the cost.
In the example shown, the first formula looks like this:
=(B4-C4)/B4
Make sure you use parentheses to control the order of operations.
Note that the result will be a decimal like 0.53, so you need to format the cell with the Percentage number format (use the ribbon or Ctrl + 1 to access all number formats).
