Betty and Wilma are the only two cashiers employed at a retail store. Each of them works the same 40 hours per week and each can check out 20 customers per hour by manually entering the price of each product purchased into the cash register. The store owner replaces the old cash registers with new ones that automatically scan product prices into the register. With the new register, Betty and Wilma can each check out 60 customers per hour. Their average labour productivity as a team before the new cash registers were introduced was ____ customers per hour and after the new machines were installed was increased to ____ customers per hour.
A. 20; 60
B. 40; 120
C. 40; 60
D. 800; 2400
Answer: A. 20; 60
Economics
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Economics