Kane Candy Company offers a coffee mug as a premium for every
ten $1 candy bar wrappers presented by customers together with $2.
The purchase price of each mug to the company is $1.80; in addition
it costs $1.20 to mail each mug. The results of the premium plan
for the years 2017 and 2018 are as follows (assume all purchases
and sales are for cash):
2017
2018
Coffee mugs purchased
730,000
820,000
Candy bars sold
5,700,000
6,720,000
Wrappers redeemed...