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?

Ican interpret and represent the remainder in division calculations sensibly for the context (eg 27.4 in calculating average height in cm: $27.44 if it represents an amount of money) solve the following problems. 15) the wildlife park charges $25.50 dollars per person to enter their park if the park made $15096 dollars today, how many people entered the park? 16) ms adams plus 2,230 other keen runners ran a marathon: between them they ran 94817.5km. how many km did each competitor run?