Madison wants to buy a car for $9000. she will borrow money and repay the total in 3 years. the required monthly payment on her credit card would be $300. the monthly payment for a personal loan would be $278. how much money would madison save if she chose the personal loan instead of the credit card?

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?