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求解一道数学题！！
Before being simplified, the instruction for computing income tax in Country R were to add 2 percent of one's annual income to the average of 100 units of County 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 County R's currency, for a person in that country whose annual income is I?答案是：50+I/40
这道题目应该怎么理解啊？标记的那句话我不明白是什么意思，式子要怎么列呢？！
求NN帮助！！ |
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