Respuesta :

Answer:

10%

Step-by-step 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

ToxicRosin
%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
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