A food service that sells 0.94L soft drinks in waxed paper cups for $1.15 each. They also sell a reusable insulated plastic 0.94L drink container for $3.18 with one free refill of soft drinks that is the first drink in the plastic cup is included in the $3.18 purchase price. Additional refills of the reusable plastic container are $0.94 each.

How many soft drinks do you have to buy before you break even on the extra cost of the insulated plastic cup?

The expected life of the plastic cup is 1000 uses. How much money would you save over the life of the plastic cup in terms of costs for drinks from paper cups?