Explanation:
Let's assume that the monthly income of the family is x.
From the problem statement, we know that the ratio of monthly income to the monthly saving is 9:2.
Therefore, we can write:
x/4320 = 9/2
To solve for x, we can cross-multiply:
2x = 9*4320
2x = 38,880
x = 19,440
So, the monthly income of the family is Rs 19,440.
To find the monthly expenditure, we can subtract the monthly savings from the monthly income:
Monthly expenditure = Monthly income - Monthly saving
Monthly expenditure = 19,440 - 4,320
Monthly expenditure = 15,120
Therefore, the monthly expenditure of the family is Rs 15,120