According to the AD-AS model, if the economy is initially at its long-run potential growth rate, then a temporary increase in the growth rate of investment spending will cause: Select one: a. an increase in the real growth rate in the long run. b. an increase in the inflation rate in the long run. c. an increase in both the inflation and real growth rates in the short run. d. no effect on real growth rate or inflation in the short run. Clear my choice

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?