Q. |
The price of petrol increases by 25%, a man reduces consumption by such a percent so that his expenditure can only go up by 15%. By what % does he decrease his consumption? |
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A. 10% |
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B. 8% |
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C. 6.25% |
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D. 5% |
Apply AB Method.
In this question decrease percentage consumption is asked. Let’s take it ‘x’
25 – x – 25*x / 100 = 15
– 5x/4 = – 10
X = 40/5
x = 8 %
Note: To solve these kinds of questions where either A or B (of AB method) is asked, you can use the hit and trial (Options elimination process) method to get the answer.
Ex. If we apply the first option i.e. 10%,
25 - 10 - 25*10/100 = 12.5% (net result must be 15. hence eliminated)
If we apply the second option i.e. 8%,
25 - 8 - 25*8/100 = 15% (net result must be 15. hence is the answer)