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How do I solve number 1

How do I solve number 1-example-1
User Icaro
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Because he ended up paying $24 more than the actual price of the drill, this is the amount of interest he paid.

In total, the repairman pays $324 in 6 equal payments. So, each payment was
\frac{\$324}6=\$54.
User Roselan
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