You receive a $11 comma 000 check from your grandparents for graduation. You decide to save it toward a down payment on a house. You invest it earning 9% per year and you think you will need to have $22 comma 000 saved for the down payment. How long will it be before the $11 comma 000 has grown to $22 comma 000 ?

Qwest airlines has implemented a program to recycle all plastic drink cups used on their aircraft. their goal is to generate $7 million by the end of the recycle program's five-year life. each recycled cup can be sold for $0.005 (1/2 cent). a. how many cups must be recycled annually to meet this goal? assume uniform annual plastic cup usage and a 0% interest rate. b. repeat part (a) when the annual interest rate is 12%. c. why is the answer to part (b) less than the answer to part (a)?