[求助]一道prep里的题

liuniu

Before being simplified, the instructions for computing income taxe in country R were to add 2 percent of one's annual income to the average of 100 units of Country R's currency and 1 percent of one's annual income. Which of the following represents the simplified formula for computing the income tax. In Country R's currency, for a person in that country whose annual income is L?

A  50+  (L/200)

B 50+  (3L/100)

C 50+  (L/40)

D 100+  ( L/50)

E 100+  (3L/100)

答案为什么是 C。 看不太懂题目。。。

谢谢XDJM了。。。

骑着绵羊飞

就是把年收入的2%加到100和年收入的1%的平均数上。。。

2%*L+（100+1%L）/2=50+L/40

liuniu

啊～原来是这样呀～

看来我得加强阅读能力了，谢谢～