请教一道prep的数学题

chiochio

Before being simplified, the instructions for computing income tax in Country R were to add 2 percent of one's annual income to the average (arithmetic mean) 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 I?
a)50+I/200   b)50+3I/100   c)50+I/40   d)100+I/50   e)100+3I/100
题目看不懂，恳请NN们不吝赐教。。。

juanjuan862

我之前也不太会，后来同学告诉我，就是读题没读明白
按照它叙述的意思，列出来的式子是：2%I+（100+1%I）*（1/2), 化简之后就得到了C