Desmond paid 8.5% sales tax when he bought a new phone. The sales tax was $12.75. What was the total cost of the phone, including tax?

$162.75

Step-by-step explanation:

8.5% = 0.085

12.75 / 0.085 = 150 (price before tax)

150 + 12.75 = 162.75

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both equations and proportions are better.

answer4 to the second power is 16

and 4 to the third power is 64,