which of the following equations can be used to determine the price of the MP3 Player before tax?

Question

. Catherine paid $201.16 for an MP3 player. If the price paid includes a 7% sales tax,

(Let x represent the cost of the MP3 player and y represent the total cost after tax.)
A. y = 0.93x
B. y = 1.07x
C. y = x + 7x
D. y = 1.7x

Answer 1

if x is the price of the MP3 player then the tax would be 7% times x or .07x

 

the total cost would be x + .07x

 

and that equals x(1+.07)  or 1.07x

Answer 2

Total Cost = Cost before tax + Tax

 

Tax = (0.07)*(Cost before Tax)

 

Total Cost = Cost before Tax + (0.07)*Cost before Tax

 

Total Cost = Cost before tax*(1 + 0.07)

 

Total Cost = 1.07*Cost before Tax

 

Total Cost = y, Cost before tax = x:

 

y= 1.07x