Which accurately explains how profit is calculated?

Answer is "Costs are subtracted from revenues".

The rate for profit is usually the % of one’s revenue that is profit. I can easily be calculated by removing the overall expenditures from the sum total of revenue, what is left can be taken as profit. When someone make a division of the revenue by the total expenditures the answer will be the rate, % of profit.

answer; self_ disclosure;

answer; (20%)percent