Respuesta :

Find out how much he makes per hour.
Ex. $320/40 hours = $8 per hour

Find out how many hours he must work to make $416.
Ex. $416/ $8 per hour = 52 hours

Find the difference between 52 hours and 40 hours (the problem asks how many more hours).
Ex. 52 hours - 40 hours = 12 hours

Answer: 12 more hours

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