The equation: a/5=c/4 shows the relationship between the number of apples purchased, a, and the total cost of the apples in dollars, c. Based on the equation, what is the cost per Apple, in dollars?

A) $0.80

B) $1.25

C) $4.00

D) $5.00

If you are trying to find the relationship between total cost of the apples and the number of apples purchased, you want to solve for cost per apple (or c/a).

to solve for c, multiply both sides of the equation by 4, to get:

(4/5) a = c

Then, to get c/a, divide both sides of the equation by a, to get:

4/5 = c/a

Therefore, the cost per apple is $4/5 or $0.80, which is answer choice A.