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(7.1A; 7.1B)
4. Rosalie bought 4 books that each
cost $15.75. She used a coupon for
20% off her purchase, and she paid
sales tax of 8%. Rounded to the
nearest cent, what was the final cost
of Rosalie's books?
A $13.61
B $50.04
C $54.43
D $68.04

Respuesta :

The total cost of the books is

[tex]15.75\cdot 4 = 63[/tex]

The coupon takes 20% of the price away, so she pays the remaining 80%:

[tex]63\cdot 0.8=50.4[/tex]

And then she adds 8%, meaning that she pays 108% of this amount:

[tex]50.4\cdot 1.08=54.432[/tex]

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