The price of coal is increased by 20 By what percent a family should decrease its consumption so tha...........

Quantitative Aptitude ( CCS) Profit and loss

The price of coal is increased by 20%. By what percent a family should decrease its consumption so that expenditure remains same?

25%

14(2/7)%

16(2/3)%

20%

Increased 20% = 1/5
Since there is increase,

so decrease in consumption will be 1/(5+1) = 1/6 = 16 2/3%
In there was decrease,

so increase in consumption would have been 1/(5-1) = 1/4 = 25%

Hence, option 3 is the correct answer.

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