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If the height of a triangle is decreased by 40% and its base is

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Joined: 07 Jun 2017
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Location: India
Concentration: Technology, General Management
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If the height of a triangle is decreased by 40% and its base is [#permalink]

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New post 24 Sep 2017, 23:10
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A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

78% (00:32) correct 22% (01:02) wrong based on 18 sessions

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If the height of a triangle is decreased by 40% and i its base is increased by 40%, what will be effect on its area?

A. No change
B. 8% decrease
C. 8% increase
D. 16% decrease
E. 16% increase
[Reveal] Spoiler: OA

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Kudos [?]: 85 [0], given: 59

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If the height of a triangle is decreased by 40% and its base is [#permalink]

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New post 25 Sep 2017, 04:25
I solved this by successive Percentage change formula.

Formula Used

If a certain number changes successively by A% and B%, the effective percentage change = \(A + B + \frac{AB}{100}\)

In this case, Effective percentage change = \(40 - 40 + \frac{(40*-40)}{100}\)

= -16 %

Hence the Area of the new triangle decreases by 16%.

Required answer = D
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Kudos [?]: 41 [0], given: 140

If the height of a triangle is decreased by 40% and its base is   [#permalink] 25 Sep 2017, 04:25
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If the height of a triangle is decreased by 40% and its base is

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