The regular price of an item at a store is p dollars. The items is on sale for 10% off the regular price. Some of the expressions below represent the sale price, in dollars, of the item.
Expression A: 0.1p
Expression B: 0.9p
Expression C: 1 - 0.1p
Expression D: p - 0.1p
Expression E: p - 0.0p
A Expression A and Expression E
B Expression B and Expression C
C Expression B and Expression D
D Expression C and Expression D

C,    Expression B and Expression D

Step-by-step explanation:

The regular price of an item at a store is p dollars. The items is

on sale for 10% off the regular price. Some of the expressions

below represent the sale price, in dollars, of the item.

It says  " item on sale for 10% off ". That means  or  .

Expression A: 0.1p

Expression B: 0.9p

Expression C: 1 - 0.1p

Expression D: p - 0.1p

Expression E: p - 0.0p

Expression A doesn't make any sense. It only shows the how

much you save

Expression C:  You can't subtract from

Expression E:   This is the same thing as

The answer is C .