Steve went to his favorite hamburger restaurant with $3, expecting to buy a $2 hamburger and a $1 soda. when he arrived, he discovered that hamburgers were on sale for $1 each, so steve bought two hamburgers and a soda. steve's response to the decrease in the price of hamburgers is best explained by:

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)?