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?
A. 60c + 85s > 310
B. 60c + 85x is less than or equal to 310
C. 60c + 85x is greater than or equal to 310
D. 60c + 85s < 310