The total income of three families is Rs. 72,000. Their expenditures are 80%, 85% and 75%, respectively. If the savings are in the ratio 8 : 9 : 20, then the income of the second family is:

Correct option is D

Given:
The total income of three families =Rs. 72,000
Their expenditures are 80%, 85% and 75%, respectively
Ratio of savings are in ratio = 8:9:20
Solution:
Let the salary of first family be 100
The ratio of their savings is 8x:9x:20x
so first family’s savings is
100-80=20%
20%=8x
100%=40x
Let the salary of second family be 100
so second family’s savings is
100-85=15%
15%=9x
100%=60x
Let the salary of third family be 100
so third family’s savings is
100-75=25%
25%=20x
100%=80x
The ratio of their salary is
40x:60x:80x = 2x:3x:4x
2x+3x+4x=72000
9x=72000
x=8000
The income of second family is 3x =24000