Before being simplified, the instructions for computing income tax in Country R were to add 2% of one's annual income to the average (arithmetic mean) of 100 unites of Country R's currency and 1% of one's annual income. Which of the following represents the simplified formula for computing the tax, in Country R's currency, for a person in that country whose annual income is I?
Answer:50+I/40
实在是理解不了，请NN帮忙
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