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1 M got an 8 percent cost-of living raise for 20$ per week

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1 M got an 8 percent cost-of living raise for 20$ per week
a M‘s new weekly salary b $260
2 A the difference between 2 num bers,each of which is between 3 and 4
B the sum of 2 numbers.each of which is between 1 and 2
这两个题目中哪个一个比较大,请告诉我为什么,)
但是答案里第一题是选A
1.每周生活费用提高8%,提高金额为20,故原来每周生活费用a原= 20 / 8%=250,
现在每周生活费用 a = 250 + 20 = 270
而新的周薪 b = 260
所以a>b
2.两个数3