Burton bush wants to retire in arizona when he is 80 years of age. burton, who is now 55, believes he will need $400,000 to retire comfortably. to date, he has set aside no retirement money. if he gets an interest of 6 percent compounded annually, he will have to invest today

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?