Question

Two months ago, the price, in dollars, of a cell phone was c.

Last month, the price of the phone increased by 10%. Write an expression for the price of the phone last month. Use c as your variable.

Answer this part:
This month, the price of the phone decreased by 10%. Write an expression for the price of the phone this month.

Answer 1

c × 0.90

Explanation:

c × 0.90, would be your answer because 10% is equal to 0.10, then you would subtract the 0.10 (10%) by 1 (100%), then multiply c times the 0.90 that you get, to get the decreased number, because you're multiplying by a decimal