On the first day of summer a rainstorm brought 2.29 inches of rain to the area. during the rest of the summer there was 3 times as much rain as on the first day. what was the total number of inches of rainfall for the summer?

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?