Question

A fuel mixture consists of 4 parts oil and 12 parts gasoline. The oil costs $0.75 per liter, and the gasoline costs $1.60 per liter. A mechanic makes 416 liters of the mixture.
(a) How much oil does he use? L

(b) How much gasoline does he use? L

(c) What is the minimum amount the mechanic should charge for each liter of the fuel mixture to guarantee at least 15% profit? (Round your answer to the nearest cent.)
$ per liter