At the grocery store, Sal buys 7 cans of beans, a jar of peanut butter and 4 cartons of milk, which costs $28.55 total. Hal buys 9 cans of beans, a jar of peanut butter and 5 cartons of milk, which costs $35.30 total. If I buy a can of beans, a jar of peanut butter and a carton of milk, i will pay:

a 8.10 b 8.15 c 8.20 d 8.25 e 8.30

this is what i have done so far.

b--> beans

p--> peanut butter

m --> milk carton

=>

=>

therefore

=

but i dont know what to do from here, or whether i even started right.

help please ?