Simple interest = principal × rate × time. ৳1 lakh at 10% simple interest for 3 years earns ৳30,000, a total of ৳1,30,000. Enter your own figures below to see the working step by step.
= 1 lakh taka
= 36 months
Simple interest
৳30,000
Total amount ৳1,30,000
৳1,00,000 at 10% simple interest for 3 years earns ৳30,000; total ৳1,30,000.
| Year | Total interest | Total amount |
|---|---|---|
| 1 | ৳10,000 | ৳1,10,000 |
| 2 | ৳20,000 | ৳1,20,000 |
| 3 | ৳30,000 | ৳1,30,000 |
The link includes the numbers you entered
I = P × r × n and A = P + I
| Principal | Rate | Time | Interest | Total |
|---|---|---|---|---|
| ৳1,00,000 | 10% | 3 years | ৳30,000 | ৳1,30,000 |
| ৳50,000 | 12% | 6 months | ৳3,000 | ৳53,000 |
Rate r = I ÷ (P × n); time n = I ÷ (P × r); principal P = I ÷ (r × n). For example ৳8,000 interest on ৳20,000 over 4 years means r = 10%.
Interest charged only on the original principal, never on earlier interest, so the yearly interest stays the same.
I = P × r × n, with r as a decimal (10% = 0.10) and n in years. Total amount A = P + I.
Convert time to years: months ÷ 12 or days ÷ 365. ৳50,000 at 12% for 6 months = 50,000 × 0.12 × 6/12 = ৳3,000.
Compound interest adds each period's interest to the principal. ৳1 lakh at 10% for 5 years: ৳50,000 simple vs ৳61,051 compound.
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