Question

A person saves 30% of his income . if his income is increased by 30% and his expenditure is increased by 21% find by what% his saving would be increased​

Answer 1

Answer:

30%

Step-by-step explanation:

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%