Real-Life Math Problem:

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Earl always fills his tank when he gets gas for his truck.  Earl also likes to use coupons.  Most of the coupons are $0.10 off per gallon and he can pay inside the gas station.

A new station opened that takes $0.12 off per gallon but you have to pay before pumping the gas.

The truck provides this information:


Can you figure out how much Earl should pay for gas when he needs more?


Edit: Apparently the request was enough for me to open a spreadsheet.  3 variables, 1 fixed number, and some manipulation of data - Here I go...


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