The compound interest on Tk. 2800 for 18 months at 10% per annum is-

Question: The compound interest on Tk. 2800 for 18 months at 10% per annum is-Solution:Interest after 1 year or 12 months = 2800 × 1 × (10/100)= 280New principal = 2800 + 280= 30806 months = 1/2 yearNow,I = Pnr= 3080 × (1/2) × (10/100)= 154∴ Total interest = 280 + 154 = Tk. 434