The population of city n is 100,000 greater than the population of city m. If both cities increase in population by x percent in a given year, how much greater is the population of city n than the population of city m after the increase?
So n-m=100000

1) x =10
So m becomes 110m/100 or 1.1m and n becomes 1.1n
So increase = 1.1n-1.1m=1.1(n-m)=1.1*100000=110000
Sufficient

2) The original population of city m was 1,4 of the original population of city n..
What does 1,4 mean.
Anyway, since we don't know X , it is not sufficient
Insufficient

A
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1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html
4) Base while finding % increase and % decrease : https://gmatclub.com/forum/percentage-increase-decrease-what-should-be-the-denominator-287528.html


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