prep 急急急 谁会做啊 给讲讲 谢

Before being simplified,the instructions for conputing income tax in Country R were to add 2percent of one’s annual income to the average of 100 units of Country and 1percent 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?

50+I/40????????????????why

这个之前有贴讨论过，昨刚好看到。

根据题意可列出：2%I+（100+1%I）/2