Given: Man saves 30% of his income Formula used: Income = Expenditure + Savings Calculation: Man saves 30% of his income is same as man’s expenditure of income = 100% - 30% = 70% Let income of man = 100 Hence, expenditure = 70 And, savings = 30 New income = 122/100 × 100 = 122, New expenditure = (110/100) × 70 = 77 Now, new savings = 122 – 77 = 45 Increase in savings = 45 - 30 = 15 Thus, percentage increase in his savings = (15/30) × 100 = 50%