Estimate the gross profit for 2021 as follows: In cell C15, create a formula without using a function that subtracts the vendor cost (cell C7) and the shipping cost (cell C9) from the sales price (cell (3), and then multiplies the result by the projected number of units for sale in 2021 (cell C10). Use absolute references to each cell in the formula.
im confused about the using absolute reference for this question​