1.

In the new budget, the price of petrol rose by 10%. By how much percent must one reduce the consumption so that the expenditure does not increase?

Answer»

Percentage increase in price of petrol = 10% 

Hence, 

Reduction in consumption while having same expenditure

 \(=\frac{\text%increase}{100+{\text%increase}}\times{100}\)

\(=\frac{10}{100+10}\times{100}\)

 \(=\frac{1000}{110}={9}\frac{1}{11}\text%\)



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