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- Question
Options- A. 40 yr
- B. 30 yr
- C. 15 yr
- D. 25 yr
- Correct Answer
- 30 yr
Explanation
Here, n = 4, R = 10, T = ?
According to the formula,
R = 100 (n - 1)/T
? 10 = [100(4 - 1)]/T = (100 x 3)/T
? T = 30 yr - 1.
In a certain time, a sum becomes 4 times at the rate of 5% per annum. At what rate of simple interest, the same sum becomes 8 times in the same duration?
Options- A. 122/3 %
- B. 113/5 %
- C. 112/3 %
- D. 123/5 % Discuss
- 2.
Kriya deposits an amount of ? 65800 to obtain a simple interest at the rate of 14% per annum for 4 yr. What total amount will Kriya get at the end of 4 yr?
Options- A. ? 102648
- B. ? 115246
- C. ? 125578
- D. ? 110324 Discuss
- 3.
A certain sum becomes 3 fold at 4% annual rate of interest. At what rate, it will become 6 fold?
Options- A. 10%
- B. 12%
- C. 8%
- D. 9% Discuss
- 4.
At the rate of 8 1/ 2% per annum simple interest, a sum of ? 5800 will earn how much interest in 2 yr 3 months?
Options- A. ? 1300
- B. ? 1109
- C. ? 1509
- D. ? 1725 Discuss
- 5.
Subbarao was approached by two neighbour for loan. He had ? 2540, a part of which he lent to one person at 12% interest per annum and the other part was lent to the second person at 12.5%. At the end of a year, Subbarao received ? 311.60 as interest on the total loan . Calculate the amount of money of money lent by him at 12% interest .?
Options- A. ? 1360
- B. ? 1340
- C. ? 1240
- D. ? 1180 Discuss
- 6.
Simple interest for the sum of ? 1230 for 2 yr is ? 10 more than the simple interest for ? 1130 for the same duration. Find the rate of interest.
`
Options- A. 5%
- B. 6%
- C. 8%
- D. 2% Discuss
- 7.
For a certain sum, the simple interest in 2 yr at 8% per annum is ? 110 more than the simple interest in 1 yr at the ratio of 5% per annum for the same sum. Find the sum.
Options- A. ? 5000
- B. ? 1000
- C. ? 1050
- D. ? 950 Discuss
- 8.
A sum was invested for 4 yr at a certain rate of simple interest. If it had been invested at 2% more annual rate of interest, then ? 56 more would have been obtained. What is the sum?
Options- A. ? 680
- B. ? 700
- C. ? 720
- D. ? 820 Discuss
- 9.
A sum becomes 6 fold at 5% per annum. At what rate, the sum becomes 12 fold?
Options- A. 10%
- B. 12%
- C. 9%
- D. 11% Discuss
- 10.
A sum becomes two fold in 6 yr at a certain rate of interest. Find the time, in which the same mount will be 10 fold at the same rate of interest.
Options- A. 35 yr
- B. 49 yr
- C. 59 yr
- D. 54 yr Discuss
Simple Interest problems
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10 Questions 40 Marks 9 Mins
Given:
The principal(P) amount becomes 4 times at simple interest(SI) in 10 years
Formula used:
SI = (P × R × T)/100
R = rate of interest
T = time period
Calculation:
According to the question:
4P = P + (P × R × T)/100
⇒ 4P = P[1 + {(R × 10)/100}]
⇒ 40 = 10 + R
⇒ R = 30
∴ Rate of interest is 30%
R% = [(n - 1)× 100]/T
According to the question,
Given:
n = 4
t = 10 years
R % = [(4 - 1)× 100]/10 = 3 × 10 = 30%.
∴ Rate of interest is 30%.
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