Question
A family spends 20% of its monthly income on house rent.
Out of the remaining amount, the family spends 50% on household expenditure and 20% on children's education. If after doing so, its monthly saving is ₹6,600, then what is the total monthly income of the family?Solution
Savings = 6,600 House rent = 20% of income Household expenditure = 50% of remaining Children's education = 20% of remaining  Remaining after house rent = 0.80x Total expenditure from remaining = 0.50 x 0.80x +0.20 × 0.80x = 0.56x  Savings=0.80x- 0.56x = 0.24x 4. Given savings: 0.24x =6,600 x =6600/0.24 =27500 Â
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