Given: Expenditure on child's education = 20% Expenditure on other items = 70% of the remaining Difference between savings and expenditure = Rs. 1600 Concept used: Savings = Total income – Expenditure Calculation: Let the total income be Rs.100x Expenditure on child's education = 20% of 100x ⇒ 20x Remaining money =(100x–20x) ⇒ 80x Expenditure on other items = 70% of 80x ⇒ 56x Total expenditure =(20x+56x) ⇒ 76x Savings =100x–76x ⇒ 24x Difference between Savings and expenditure on education =24x–20x ⇒ 4x Now, according to question 4x=Rs.1600 ⇒100x=Rs.(1600/4x)×100x ⇒ Rs. 40,000 ∴ The income of man is Rs. 40,000