Question

A customer pays $18 for a DVD that originally cost $20. What is the percent decrease in the cost of the DVD? Show Work!

(A) 2%
(B) 10%
(C) 11%
(D) 18%

Answer 1

%10 of 20 is 2, so take 2 off 20 you get 18
%2 of 20 is .4, so take .4 off 20 you get 19.60
%11 of 20 is 2.2, so take 2.2 off 20 you get 17.80
%18 of 20 is 3.6, so take 3.6 off 20 you get 16.4

B is the correct answer

Answer 2

10%

Explanation:

i used cross multiplication.

100%=$20

????=$18

100•18/20

=90

this is its percentage. to find the percentage decrease take 100-90

=10