7 We all hate to bring small change to the store. Using random numbers, we can eliminate the need for change and give the store and the customer a fair shake.

a Suppose you buy something that costs $.20. How could you use random numbers (built into the cash register system) to decide whether you should pay $1.00 or nothing? This eliminates the need for change!

b If you bought something for $9.60, how would you use random numbers to eliminate the need for change?

c In the long run, why is this method fair to both the store and the customer?