A sum of money triples itself in 12 years. Find the rate percent per annum.

Let the Principal = Rs 100 Amount = Rs 300 ⇒ Amount = P + I ⇒ 300 = 100 + I I = 300 – 100 = Rs 200 ⇒ R = (SI x 100)/(P x T) ⇒R = 200 x 100/(100 x 12) R = 16.66% p.a.

- Akshay invested Rs. 2240 in two schemes P and Q in the respective ratio of 9:7. Scheme P and Q are offering simple interest at the rate of 10% per annum and 12% per annum, respectively. Find the interest obtained after 2 years from scheme P.
- What sum of money must be given at simple interest for 9 months at 5% per annum in order to earn Rs. 360 interest?
- Find the difference between True discount and Simple Interest on Rs. 7200 due after 5 years @ 4% per annum.
- The simple interest received after 5 years on Rs. (x + 500) at the rate of 20% p.a. is Rs. (2x – 1500). The amount received on Rs. 3x when invested at 40% p.a. compound interest, compounded annually for 2 years can be:
- Vishal has certain sum of money with him. He invested 80% of the sum in scheme ‘X’ offering 15% p.a. simple interest for 8 years and received Rs. 2760 as interest. He then invested the amount received from scheme ‘X’ in scheme ‘Y’ for 2 years at 50% p.a., compound interest compounded annually. Find the amount received by Vishal from scheme B.
- On Rs. 6000 invested at a simple interest at the rate of 4% p.a., Rs. 2400 is obtained as interest in certain years. In order to earn Rs. 4800 as interest on Rs. 10,000 in the same number of years, what should be the rate of simple interest?
- A company declared 20% discount for wholesale buyers on an item. A wholesaler bought the item from the company for ₹400 after getting a discount. He fixed up selling price of the item in such a way that he earned a profit of 15% on the original company price. What is the selling price of the item?
- Vishal has certain sum of money with him. He invested 80% of the sum in scheme ‘X’ offering 15% p.a. simple interest for 8 years and received Rs. 2040 as interest. He then invested the amount received from scheme ‘X’ in scheme ‘Y’ for 2 years at 50% p.a., compound interest compounded annually. Find the amount received by Vishal from scheme B.
- The difference between the compound interest, compounded annually and simple interest on Rs. ‘P’ at the rate of 25% p.a. for 2 years, is Rs. 100. If Rs. (P + 1600) is invested at the same rate p.a., then find the compound interest, compounded annually earned after 3 years.
- ₹2,500, when invested for 8 years at a given rate of simple interest per year, amounted to ₹3,725 on maturity. What was the rate of simple interest that was paid per annum?

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