Carcass wrote:
You need to purchase a textbook for nursing school. The book cost $80.00, and the sales tax where you are purchasing the book is 8.25%. You have $100. How much change will you receive back?
A. $5.20
B. $7.35
C. $13.40
D. $19.95
E. $21.25
Since the answer choices are quite spread apart, we can make our calculations much easier by using 8% in our calculations (rather than waste time using 8.25%)
8% of $80 = (8/100)(80) = 640/100 = $6.40
So the total cost (including tax) ≈ $80 + $6.40 ≈ $86.40
So the change we'll receive back ≈ $100 - $86.40 ≈ $13.60
Since answer choice C is the closest answer, it must be correct.