Algebra
posted by Joan .
Could someone please explain the equation which is used for profit?

Profits=incomecosts
There are hundreds of "formulas" for profit. 
Profit = Revenue  Cost
Suppose you have a lemonade stand.
It costs you 10 cents to make a glass of lemonade. You charge each customer 25 cents a glass. Therefore your profit is 15 cents per glass.
15 = 25  10
http://earthmath.kennesaw.edu/main_site/review_topics/economics.htm