When the fed sells bonds in the open market, we can expect: bond prices to fall and interest rates to rise. bond prices and interest rates to fall. bond prices and interest rates to rise. bond prices to rise and interest rates to fall?

The management of a supermarket wants to adopt a new promotional policy of giving a free gift to every customer who spends > 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?