Fee (f): 470=f+7(1.2f) 470=f+8.4f 470=9.4f f=470/9.4 f=50 Fee is 50$ Now, to find how much he charges an hour (h): h=1.2f h=1.2×50 (we just found out that fee charge is 50$) h=60 He charges 60$ an hour. Now lets check: Does 7(60)+50 equal to 470? Yes. So, fee is 50$ and hour charge is 60$. Hope this helps.
