A grocery store buys cereal using the cost function c(n) = { 2n when n < 100 1.9n when 100 n 500 1.8n when n> 500 where n is the number of boxes of cereal the grocery store buys and c(n) is the cost of the cereal. The grocery store then sells the cereal using the sales function s(c) = 1.3c. What is the cost of the cereal if the grocery store buys 250 boxes?