A
If you were an exchanged student in New York City, one day your math teacher gave you following questions as your homework, please write down your answers.
Ⅰ.A company sold a product for α dollars in 1990. The price of the product would increase by 2.5% every year.
21. Which of the following expressions could be used to calculate the price of the product in the year 2000?
A. α× (25)10 B. α× (0.25)10 C. α× (1.25) 10 D. α× (1.025)10
Ⅱ.A man needs to make 3 curtains. The cloth which is used to make curtains sells for $8.00 per meter and can be purchased only by the full（完整的） meter. The length of cloth required for each curtain is 1.6 meters.
22. What is the total cost of the cloth that needs to be bought for the 3 curtains?
A.$40.00 B.$24.00 C.$38.40 D.$48.00
Ⅲ.A pet store sells only dogs and cats. In March, the store sold twice as many dogs as cats. In April, the store sold twice the number of dogs that it sold in March, and three times the number of cats that it sold in March.
23. If the total number of pets the store sold in March and April combined was 500, how many dogs did the store sell in March?
A. 80 B.100 C.120 D.160
