The monthly income of a person was Tk. 13500 and his monthly expenditure was Tk. 9000. Next year, his income increased by 14% and his expenditure by 7%. Find the percentage increase in his savings.

Question: The monthly income of a person was Tk. 13500 and his monthly expenditure was Tk. 9000. Next year, his income increased by 14% and his expenditure by 7%. Find the percentage increase in his savings.

Solution:
Savings before increased income = Tk. (13500 - 9000)
= Tk. 4500

Increased income = 114% of 13500 = Tk. (114/100) × 13500
= Tk. 15390

Increased expenditure = 107% of 9000 = Tk. (107/100) × 9000
= Tk. 9630

Saving after Increased income = Tk. (15390 - 9630) = Tk. 5760

Increased Savings = Tk. (5760 - 4500)
= Tk. 1260

∴ Increase % in savings = (1260/4500) × 100 %
= 28%