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20 Feb 2013, 22:37
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88% (01:36) correct
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If the sides of a rectangle are increased by 15%, what is the percentage increase in the area?
A. 32.25%
B. 40%
C. 37.50%
D. 36.75%
E. 32%
A. 32.25%
B. 40%
C. 37.50%
D. 36.75%
E. 32%
21 Feb 2013, 00:52
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antoxavier
If the sides of a rectangle are increased by 15%, what is the percentage increase in the area?
A. 32.25%
B. 40%
C. 37.50%
D. 36.75%
E. 32%
A. 32.25%
B. 40%
C. 37.50%
D. 36.75%
E. 32%
If sides are a and b, after increase sides would be 1.15a and 1.15 b.
Percentage increase in area = (1.15a*1.15b - ab) *100/ab = 32.35%
ans A it is.
21 Feb 2013, 03:44
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antoxavier
If the sides of a rectangle are increased by 15%, what is the percentage increase in the area?
A. 32.25%
B. 40%
C. 37.50%
D. 36.75%
E. 32%
A. 32.25%
B. 40%
C. 37.50%
D. 36.75%
E. 32%
Say both sides of the rectangle are equal to 100 (so consider that we have a square). In this case the area is 100*100=10,000.
The area of new rectangle would be 115*115=13,225, which is 32.25% greater than the old area.
Answer: A.
