On a 50 question test a student awncerd 5 questions wrong what percent did he awncer correctly

Omar is going on a road trip! the car rental company offers him two types of cars. each car has a fixed price, but he also needs to consider the cost of fuel. the first car costs $90 to rent, and because of its fuel consumption rate, there's an additional cost of s0.50 per kilometer driven.

I'm confused on this could anyone me and show me what i need to do to solve it.

Need asap. solve for the following inequality