1)If the dollar amount of sales at Store P was $800,000 for 2006, what was the dollar amount of sales at that store for 2008 ?

　　A $727,200

　　B $792,000

　　C $800,000

　　D $880,000

　　E $968,000

　　直接算，800000*(1+10%)*(1-10%)=792000，即B

　　2)At Store T, the dollar amount of sales for 2007 was what percent of the dollar amount of sales for 2008 ?

　　Give your answer to the nearest 0.1 percent.___________%

　　直接算，1/(1-8%)=108.7%(约等于)

　　3)Which of the following statements must be true?

　　Indicate all such statements.

　　A For 2008 the dollar amount of sales at Store R was greater than that at each of the other four stores.

　　B The dollar amount of sales at Store S for 2008 was 22 percent less than that for 2006.

　　C The dollar amount of sales at Store R for 2008 was more than 17 percent greater than that for 2006.

　　本题A选项一看到就可以排除了，涉及到两个店的绝对量的比较，这个不确定，没有告诉绝对值。B选项是把两个增长的比例简单地算术相加。肯定错了。所以C肯定是对的了。。算一下也是的确是对的。。