The price of petrol rose by 20%. By how much per cent must a motorist reduce his consumption of
petrol so that his expenditure on petrol does not increase?
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Step-by-step explanation:
let the price of petrol be 100
Increase % = 100 + 20 =120
decrease %= 100-20=80
reduce %=80/120×100=2/3×100
200/3=66 2/3% ( in whole)
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