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 grocery store's sales from selling cereal if the grocery store buys 100 boxes and sells all of them?