Regular pay rate x 40 hours = Regular pay, plus
Regular pay rate x 1.5 x 2 hours = Overtime pay, equals
He works 47 hours and his pay rate is 17.00
His gross pay will be:
40*17 = $680
Now, his gross pay plus overtime will be:
$680 + (1.5*7*17) = $680 + $178.5 = $858.5
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Mark worked 51 hours and his pay rate is $15.00
Gross pay before overtime = 40*15 = $600
Gross pay plus overtime = $600 + 11*1.5*15 = $847.5