Question

the cost of petrol increased by 40% and a person reduces his consumption by 20% find the percentage change in his expenditure

Answer 1

let the cost price is Rs 100

Selling price=140/100*100=Rs140

new consumption=80

Let the original consumptio is =Rs 100

Original expenditure=100*100=10,000

New expenditure=80*140=11200

change in expenditure=11200-10000=1200

Perentage=1200/10000*100=12%

Answer 2

Answer:

Percentage change in his expenditure is = 12%