First, how many weeks are in 10 months?
Appx. 43.5 weeks. (or if you wanna be exact: 43.4524)
20*8.50=170
70*43.5=$3045
(Or once again if you wanna get the exact amount lol 70*43.4524=3041.668)
If by saving half it means "half of the answer you originally get" then just divide your answer by 2.
Honestly not sure if I did this right lol, someone correct me if I'm wrong.