Suppose you deposit $4000 in a savings account that pays interest at an annual rate of 3.1% compounded continuously. Use the graph to find
out how many years will it take for the balance in your savings account to
reach $5625.41? (Round your answer to the nearest number of years)

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?