Your friend really wants to buy the newest, coolest cell phone which will cost him $310. He gets a job detailing cars and SUVs and plans to save all the money he earns. If he gets paid $60 to detail a car and $85 to detail an SUV, which of the following linear inequality can be used to determine how many of each he must detail in order to earn at least $310?
Group of answer choices
A. 60c + 85x 310
C. 60c + 85x 310