Mr Perez earned $320 this week working 40 hours. how many more hours would he have to work to earn $416?

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