15. The price of petrol goes up by 10%. By how much per cent must a motorist reduce the
consumption of petrol so that the expenditure on it remains unchanged?
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Answer:
let price before =100
price after hike=110
100/110=10:11
consumption reduce from 11 to 10
percentage reduce in consumption is (1/11)*100=9.09%
Step-by-step explanation:
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