Description:
(5 - 3) = 2 years interest = (500 - 460) = 40 tk
1 years interest = 40/2 = 20 tk
3 year's interest 20 × 3 = 60 tk
Principle amount = (460 - 60) = 400 tk
Interest rate = (60×100)/(400×3) = 5% (ans)