In what time does a sum of money become four fold at the simple interest rate of 10% per annum?

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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

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Simple Interest problems

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Search Results

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• 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



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Free

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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