Emma is planning a surprise party. she is considering using one of two venues. the banquet of hall a will cost $862 fot a reservation, plus $76 per dinner. the banquet of hall b will cost $75 per dinner, in addition to $894 for the reservation. in order to make the best decision , emma figures out-how many guests it will take to have the venues cost the same amount? what woyld the total cost be? how many guest would it be?

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?