[求助]l两道数学题目

Dancy123

 请大家帮忙看看这两道题目：

1.Before being simplified, the instructions for computing income tax in Country were to add 2percent 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?                                                                             

    (answer:50+I/40)

这个题目也是关键的那句话没读懂

2. What is the greatest common divisor of positive integers m and n?

   (1) m is prime number.

   (2) 2n=7m

    （answer：C）

Dancy123

顶一下

xp635

1题：

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

2题

（1）not sufficient

(2)n=7,m=2;n=14,m=4

 (1)+(2)positive common divisor of m,n=1