问道模考时遇到的数学题~连看都看不懂，好心人帮忙看一看啊~

烧饼的梦

Before being simplified,the instructions for computing income tax in country R were to add 2% of one's annual income to the average of 100 units of country R's currency and 1% of one's annuaul income. Which of the following reprents the simplified formula for computing the income tax, in country R's currency, for a person in that country whose annual income is I?  答案是50+(I/40)

烧饼的梦

恩恩，谢谢啦呵呵~~~~明白鸟~~~~

jenny1989

意思是说化简个人所得税的式子之前，个人所得税的计算方法是，一个人的年收入的2%加上（这个国家的100块钱和这个人年收入的1% 的平均数）即

2%I+（100+1%I)/2=50+I/40