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Bunuel
In the year 2001, a company's sales increased by x percent from the year 2000. In 2002, sales decreases x percent from the year 2001. If the sales in 2002 is 9 percent less than that in 2000, what is x?

A. 20
B. 30
C. 40
D. 50
E. 60

Lets say Sale was 100 in the year 2000 so the resultant sale in 2002 was 91.
Now try to fill the gap with options.
100 -> 120 -> (.8*120) doesn't result in 91
100 -> 130 -> (.7*130) results in 91.
IMO B.
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Bunuel
In the year 2001, a company's sales increased by x percent from the year 2000. In 2002, sales decreases x percent from the year 2001. If the sales in 2002 is 9 percent less than that in 2000, what is x?

A. 20
B. 30
C. 40
D. 50
E. 60


Let’s let n = the sales in the year 2000. We can create the equation:

0.91n = n * (100 + x)/100 * (100 - x)/100

0.91 = (10,000 - x^2)/10,000

9100 =10,000 - x^2

x^2= 900

x = 30

Answer: B
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