PP-T1-PS-175

[christinehsu]

Q175
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

Answer : C

請問這題題目敘述到底是在講什麼呀?!
怎麼看都看不懂。 不好意思! 麻煩大家了!
謝謝 :)

[sunnyblue13s]

(2/100)I + 1/2(100+I/100) = 50 + 5I/200 = 50 + I /40

[willow]

請問 1/2(100+I/100) 是怎麼推導出來的阿？

[leafage]

(2/100)I + 1/2(100+I/100) = 50 + 5I/200 = 50 + I /40

原題如下：
add 2% of one's annual income to the average of (100 units of Country R's currency and 1% of one's income)
= 0.02I + average(100+0.01I)

[lovelymaomo[origen]]

請問可以將這題的意思翻譯一下嗎?
因為我連題目都看不懂= =
要麻煩大家了
謝謝:)