Ana and Katrina are buying fruit to bring to their book club meeting. Ana buys 2. 4 lb of oranges and 0. 8 lb of cherries. Katrina buys 1. 8 lb of oranges and 1. 3 lb of cherries. Oranges cost r dollars per pound, and cherries cost c dollars per pound. Write and expression with exactly two terms for the total cost of the fruit Ana and Katrina buy. Show your work