QR problem -_-

[sap1622]

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hey all, this is a really simple problem but I can't remember the trick to do it really quick. I know how to do the problem, by picking numbers but I feel like theres and even faster way. Am I right or is picking numbers the trick lol? Here it is:

Sales reductions force a factory to cut back its output by 20%. By what percent must the reduced sales be increased to allow production to be bought back to normal?

A. 40
B. 30
C. 35
D. 20
E. 25

Ans. E

 

[seunglim87]

simple question. lets say the original production was 100. after the 20% reduction, the output would be 80. in order to go back to the original output, they must produce 20 more product. (20/80)x100=25