238) simple annual interest: one investment’s interest rate is x, other investiment is $5000(not sure ), interest rate is y ask what is the first investment ? making the interest on these two investment to be same at the end of the year. 1) the interest at the end of the year is$….(a number) 2) y=2x (or x=2y) 作者答案及思路: remeo评价意见:B 应该是D吧?