Question

Ravi saves 18% of his income. If his income is increased by 20% and expenditure
increases by 1/12th of the original expenditure, then find the increment in his
savings is what percent of his initial income.
1. 12 2/3%
2. 13 2/6%
3. 13 1/6%
4. None of these​

Answer 1

Answer:

Let his total income be I1=100x .

He spends 60% of his income. So, expenditure E1=60x , [savings S1=40x ]

His income increases by 15%. So, new income, I2=115x

Expenditure increases by 5%. So, 5% increase on 60x results in new expenditure E2=63x

So, new savings S2=115x−63x=52x

So, percentage change in savings can be calculated as:

S2−S1S1×100

=52x−40x40x×10

=30% (Answer)

Answer 2

the explanation is given in the image , hope this will help you out