t a store, 3 boxes of cereal A and 2 boxes of cereal B cost $19.50, and 1 box of cereal A and 3 boxes of cereal B cost $17.00. What is the cost per box of brand A and the cost per box of brand B? At a store, 6 boxes of cereal A and 11 boxes of cereal B cost c dollars, and 1 box of cereal A and 3 boxes of cereal B cost $17.00. What is the cost per box of brand A and the cost per box of brand B?