Robin earned $4,320 in 9 weeks and worked 40 hours in each week. how much did he earn per hour?

You take 4,320 divide by 9 = 480 dollar weekly

now you take 480 weekly pay and divide by 40 hours worked =12 dollars per hour worked

12[per hour ]x 40{hours worked} =480 [weekly pay check] x 9[weeks worked in all]= 4320 [totaled earned in 9 weeks ]

hope this helped