Peter could save 10% of his income .But two later when his income is increased by 20% , he could save the same
amount only as before . By how much percent has his expenditure increased ?
Let original income = Rs. 100, Then , saving = Rs.10 and expenditure = Rs.90
New income = Rs.120, new saving = Rs.10.
new expenditure = Rs.(120 - 10) = Rs. 110
Increase in expenditure = Rs.(110 - 90) = Rs. 20
`:.` Increase % = `(20/90 xx 100)`% = `22 2/9`%.
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