请教prep175

梦想守护者

Before being simplified, the instructions for computing income tax in Country R were to add 2 percent of one's annual income to the average (arithmetic mean) 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 currency, for a person in that country whose annual income is I ?明白的筒子能给翻译一下吗，盯着看了5分钟，也没看明白，不胜感激……！！

宝佳熊

2%*I+(100+1%I)/2=50+5I/200=50+I/40

梦想守护者

哦，谢谢ls，看了式子才发现没注意average！