What is the total interest on Tk. 3,000 at 12.5% per annum for 9 months?

Question: What is the total interest on Tk. 3,000 at 12.5% per annum for 9 months?

Solution:
আসল, P = 3,000 টাকা
সুদের হার, r = 12.5% = 12.5/100 = 1/8
সময়, n = 9 মাস = 9/12 = 3/4 বছর
সুদ, I = Pnr/100
⇒ সুদ, I = 3,000 × (3/4) × (1/8)
∴ সুদ, I = 281.25 টাকা