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12 Sep 2016, 17:56
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
78% (01:09) correct
22%
(01:20)
wrong
based on 76
sessions
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List of interchangeable percentage(%)
One can use the below table to change percentage.
Example if A to B we have X% Increase.
What will (let Y) be the percentage decrease from B to A.
This can be easily calculated if X= 25% then Y = 20%
Refer below table for some known handy conversions.
........ % Increase ... % Decrease
........ =========== =============
100/11 = 9.09 ........ 8.33 ........ X/12
100/10 = 10 ........... 9.09 ........ X/11
100/9 = 11.11 ........ 10 ........ X/10
100/8 = 12.5 ......... 11.11 ........ X/9
100/7 = 14.28 ........ 12.5 ........ X/8
100/6 = 16.66 ........ 14.28 ........ X/7
100/5 = 20 ........... 16.66 ........ X/6
100/4 = 25 ........... 20 ........ X/5
100/3 = 33.33 ........ 25 ........ X/4
100/2 = 50 ............ 33.33 ........ X/3
100/1 = 100 ............ 50 ........ X/2
The above is a generic rule to refer. The above rules once understood will help aspirants to solve the question within seconds.
Now a question based on the above rule:
One can use the below table to change percentage.
Example if A to B we have X% Increase.
What will (let Y) be the percentage decrease from B to A.
This can be easily calculated if X= 25% then Y = 20%
Refer below table for some known handy conversions.
........ % Increase ... % Decrease
........ =========== =============
100/11 = 9.09 ........ 8.33 ........ X/12
100/10 = 10 ........... 9.09 ........ X/11
100/9 = 11.11 ........ 10 ........ X/10
100/8 = 12.5 ......... 11.11 ........ X/9
100/7 = 14.28 ........ 12.5 ........ X/8
100/6 = 16.66 ........ 14.28 ........ X/7
100/5 = 20 ........... 16.66 ........ X/6
100/4 = 25 ........... 20 ........ X/5
100/3 = 33.33 ........ 25 ........ X/4
100/2 = 50 ............ 33.33 ........ X/3
100/1 = 100 ............ 50 ........ X/2
The above is a generic rule to refer. The above rules once understood will help aspirants to solve the question within seconds.
Now a question based on the above rule:
The price of onions increases by 25%, by what percent should a housewife reduces the consumption so that expenditure on onions can be same as before?
a) 14.28
b) 16.66
c) 20
d) 25
e) 33.33
13 Sep 2016, 00:36
Kudos
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Expenditure = Consumption * Price = CP
Now the price increases by 25% => Expenditure = C * (1.25P)
Let C1 be the new consumption such that the expenditure remains the same.
C* P = C1 * (1.25P)
C1 = 0.8 C
20% reduction in consumption is needed.
Now the price increases by 25% => Expenditure = C * (1.25P)
Let C1 be the new consumption such that the expenditure remains the same.
C* P = C1 * (1.25P)
C1 = 0.8 C
20% reduction in consumption is needed.
13 Sep 2016, 01:57
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rudra316
Hi Rudra316. This is correct explanation.
I have provided a generic rule to get these question quickly while reading the question. Kindly check the spoiler before question.
