Solve the percent change problem using the proportion formula. List the information given by each situation. Show the substitution into the proportional formula equation. State the final result in complete sentence using the appropriate unit.

Question

Sofie was charged a $4.32 sales tax when she purchased a $54 pair of leggings. What sales tax rate did the store charge Sofie for her purchase?

Using the information given, choose the best answer.

percent = ________

4.32

54

Answer 1

First, calculate the percent change using the proportion formula:

(percent/100) = 4.32/54

Now, substitute the given values:

(percent/100) = 0.08

Solve for the percent change:

percent = 0.08 x 100

percent = 8%

Therefore, the store charged Sofie an 8% sales tax rate for her purchase.