Question

Mira's expenditure and sayings are in the ratio 3: 2. her income increases by 10 percent. her expenditure also increases by 12 percent. by how much per cent does her saving increase?

Answer 1

"Let th4e total money be Rs.100.

So, the expenditure = Rs.60 and savings = Rs.40(Rs.100 in the ratio of 3:2)

Now, the income increases by 10%.

So, the new income = Rs.110.

Expenditure is increased by 12% 

So, the new expenditure = Rs.67.2

And, the new savings =Rs. 110 - 67.2 = Rs.42.8 

Increase in savings= Rs. 42.8-40= Rs. Rs. 2.840.

Therefore, Percentage increase in savings = 2.840/40x100= 7%

So, the % increase in Savings = 7%."

Answer 2

Answer:

7% (or) 0.07

Step-by-step explanation:

Let Mira's expenditure and savings be 3x and 2x respectively.  

Then her income =5x

Increased income =  100

110×5x=5.5x

Increased expenditure =  100

112  ×3x=3.36x

∴ Increased savings = 5.5x−3.36x=2.14x

∴ % increase in savings =(  2x 2.14x−2x   ×100)%=( 2x 0.14x×100)%=7%