1) Total pay = $85 + ($0.15/mile)m, where m is the # of miles driven.
2) 10 miles: $85 + $1.50 = $86.50
35 miles: $85 + $5.25 = $90.25
100 miles: $85 + $15 = $100
250 miles: $85 + $37.50 = $122.50
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