Need Help on this math problem. Thank you

Question

Kim bought new shoes and used a 12% off coupon. The original cost of the shoes is represented as s .
The total amount Kim paid for the shoes is represented as s −0.12s= 0.88s, which means that (AN INCREASE OR DECREASE) of 12% is the same as MULTIPLYING BY 1.12

                                 MULTIPLYING BY 0.88

                                 SUBTRACTING BY 1.12

                                 SUBTRACTING BY 0.88

Answer 1

decrease of price by 12% means that you pay only 88% (multiplying s by 0.88).

 

BTW: "subtracting by" a number is WRONG ENGLISH; a number is subtracted FROM another.

So the word BY ought to be deleted in the two subtracting cases.

TELL YOUR TEACHER!!