The price of petrol goes up by 10percent. by how much percent must a motorist refuse the consumption of petrol so that the expenditure on it remains unchanged
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let as suppose previous salary = x
interment = x × 20/100 = 20/100x
present salary = 30600
x +20/100x = 30600
100x+20x/100 = 30600
120x/100=30600
1x=30600×100/120
x= 25500
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