一道prep的PS问题 [求助]

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

完全不理解题目的意思……

c

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

2%I+(100+1%I)/2    这个题的确很恶

明白了^^ 谢谢！