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Answer :

Grifjingo

Answer:

A. 3 and a half hours (3 hours 30 minutes)

B. 72 dollars

Step-by-step explanation:

A. first do 512-92 = 420

420/120 = 3.5 hours

B. 2 hours = 240 dollars

312 - 240 = 72 dollars for the parts

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