A can of dog food is on sale for 20% off the original price if the price is $1.35 what’s the discount

Canned dog food is on sale for 20% off the original price. What is the discount of a can if the original price is $1.35

Discount is 20% of original price

Discount=20% * Original Price

=0.20*1.35

Discount=$0.27

answer: c

substitute in the values.

for a:

f(0) = 0 + 9

f(0) = 9

a is a solution.

for b:

f(7) = 14 + 9

f(7) = 23

b is a solution.

for c:

f (3) = 6 + 9

f(3) = 15

c is not a solution. it's supposed to be 14.

for d:

f(2) = 4 + 9

f(2)= 13

d is a solution.