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If the length and width of a rectangular garden plot were ea

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If the length and width of a rectangular garden plot were ea [#permalink]

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The Official Guide For GMAT® Quantitative Review, 2ND Edition

If the length and width of a rectangular garden plot were each increased by 20 percent, what would be the percent increase in the area of the plot?

(A) 20%
(B) 24%
(C) 36%
(D) 40%
(E) 44%

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Question: 89
Category: Geometry Area
Page: 73
Difficulty: 600


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Re: If the length and width of a rectangular garden plot were ea [#permalink]

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Let initial length and width be l and w respectively.

Initial area = lw

New length = (6/5) l
New width = (6/5) w

New area = (36/25) lw or 144%.

Hence, increase of 44%

Answer (E).
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Re: If the length and width of a rectangular garden plot were ea [#permalink]

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The quickest way to do this is to pick numbers: l = 10 & w = 10;
Note: Both l & w can be same as a square is also a rectangle.

Original area = lw =10 * 10 = 100;

Since l & w are increased by 20% each, l & w = 12;
New area = lw = 12 * 12 = 144;

% increase in area = 144 - 100 = 44%.

Ans is (E).
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Re: If the length and width of a rectangular garden plot were ea [#permalink]

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New post 12 Feb 2014, 07:09
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My method might seem long but once you get a hang of it, it seems easier.


Whenever we are asked to "increase" any quantity by some precentage value. Add that value with 100 and then perform the operations.

As in this case the sides are increased by 20%
By adding 20 to 100 we will get 120%
Both the sides are increased by 20% , therefore we have l=120% and b=120%

We have to find the area, formula for the area is l*b = 120%*120% = 14400 = 14400/100 = 144%

Remove the original 100 back to get 44%

Remember when we say 120 percent length, it means 100% of original length + 20% is the increament



You can use it with decimal too.
suppose l = x and b = y
Area = xy
New l2 = 1.2x (Why 1.2? becasuse original was 1x and it increased by 20% which is 0.2)
b2 = 1.2y
Area = 1.2x *1.2y = 1.44 xy

Last edited by b2bt on 15 Feb 2014, 07:57, edited 1 time in total.
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Re: If the length and width of a rectangular garden plot were ea [#permalink]

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New post 15 Feb 2014, 07:08
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Re: If the length and width of a rectangular garden plot were ea [#permalink]

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New post 26 Apr 2016, 13:51
Consider length of rectangle be L and width be W
original area = L * W
increased length = 1.2 L
increased width = 1.2 W
new area = 1.2 L * 1.2 W = 1.44 LW
Clearly a 44% increase in area
correct answer - E
Re: If the length and width of a rectangular garden plot were ea   [#permalink] 26 Apr 2016, 13:51
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