Sales tax problem

Question

Luis bought two movies at his local store. The regular price for each movie was r dollars. The store charged Luis the regular price for the first movie and gave him a 25 percent discount on the second movie. He was charged 8 percent sales tax on the entire purchase. Which of the following expressions gives the total, in dollars, Luis paid, including sales tax?

 

A) 1.08r+0.75r

B) 1.08(2(0.75r))

C) 1.08(r+0.75r)

D) 1.08(r-0.25r)

Answer 1

If the cost of the movie = r, then the cost of the second discounted movie would be 0.75r. Why? Because 25% is being taken off of the full cost of a movie, and 25% = 0.25.

 

1 - 0.25 = 0.75

 

Now, 8% sales tax can be converted to a decimal also. 

 

8% = 0.08

 

The cost of the entire purchase before tax is 

 

r + 0.75r

 

Since the entire purchase is being assessed the 8% sales tax, then this can be expressed as 

 

1.08 (r + 0.75r)

 

The correct choice is C