Your plan calls for using apprentice plumbers in place of fully licensed plumbers for some jobs. If the apprentice plumbers are 60% as productive as licensed plumbers and licensed plumbers cost $60 per hour, what is the most you should pay for apprentice
plumbers?

A) $8
B) $36
C) $60

The management of a supermarket wants to adopt a new promotional policy of giving a free gift to every customer who spends more than a certain amount per visit at this supermarket. the expectation of the management is that after this promotional policy is advertised, the expenditures for all customers at this supermarket will be normally distributed with a mean of $95 and a standard deviation of $20. if the management wants to give free gifts to at most 10% of the customers, what should the amount be above which a customer would receive a free gift?