john's bikes uses the retail inventory method sales at retail were $120,000. net purchases were $68,000 at cost and $124,000 at retail. beginning inventory was $32,000 at cost and $76,000 at retail method, what was the inventory at cost?
a.$24,000
b.$120,000
c.$40,000
d.$60,000

Charlie is at an amusement park that has 18 different rides. each ride costs $1.75. the function c(r) = 1.75r represents the total amount of money that charlie will spend if he goes on r rides, but he never goes on the same one more than once. what domain and range are reasonable for the function?