Please answer correctly

Consider the graph of the exponential function y=3(2)×

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?

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