I cant fail this class

Ms.ortiz sells tomatoes wholesale. the function p(x)=-80x^2+320x-10, graphed below, indicates how much profit she makes on a load of tomatoes if she makes on a load of tomatoes if she sells them for 4-x dollars per kilogram. what should ms.ortiz charge per kilogram of tomatoes to make on a load of tomatoes?

Having a hard time understanding this question (see attachment).

1. how do you convert the repeating, nonterminating decimal 0. to a fraction? explain the process as you solve the problem.