Grace's gross pay is $550.
Grace's gross pay is the sum of the the amount she earns for her normal working hours and the amount she receives for the overtime.
Amount she receives for her normal working hours = normal hours worked x pay per hour
$10 x 40 = $400
Amount she receives for the overtime = (10 x 1.5) x 10 = $150
Total gross pay = $400 + $150 = $550
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