before being simplified, the instruction for computing income tax in country R were to add 2 percent of one's anuual income to the average 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 currrency, 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 关键我不太看得明白the average of 100 units of countryR's currency 是什么意思