The price of oil is increased by 20%. However, the expenditure on it increases by 15%. What is the percentage increase or decrease in the consumption of oil?
Let original price and consumption on oil be Rs. 10 each
=> Expenditure initially = $$10\times10=Rs.$$ $$100$$
New price after 20%Â increase = Rs. 12 and new expenditure = Rs. 115
=> New consumption = $$\frac{115}{12}$$
$$\therefore$$ Decrease in consumption = $$\frac{10-\frac{115}{12}}{10}\times100$$
=Â $$\frac{5}{12}\times10=4\frac{1}{6}\%$$
=> Ans - (B)
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