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- Question
- At the certain rate of simple interest, a certain sum doubles itself in 10 years. It will treble itself in?
Options- A. 15 years
- B. 20 years
- C. 30 years
- D. 12 years
- Correct Answer
- 20 years
ExplanationLet principal = P. Then, S. I = P. and Time = 10 years
? Required time = [(n - 1) x t] / (m - 1)
= [(3 - 1) x 10] / (2 - 1)
= 20 years - 1. A sum of money put at simple interest trebles itself in 15 years. The rate per cent per annum is?
Options- A. 131/3%
- B. 162/3%
- C. 122/3%
- D. 20% Discuss
- 2. A sum of money amounts to Rs. 850 in 3 years and Rs. 925 in 4 year. The sum is?
Options- A. Rs. 600
- B. Rs. 575
- C. Rs. 625
- D. Data inadequate Discuss
- 3. If Rs. 64 amount to Rs. 83.20 in 2 years. What will Rs. 86 amount to in 4 years at the same rate percent per annum?
Options- A. Rs. 137.60
- B. Rs. 124.70
- C. Rs. 114.80
- D. Rs. 127.40 Discuss
- 4. A sum of money amounts to Rs. 702 in 2 years and Rs. 783 in 3 years. The rate percent is?
Options- A. 12% per annum
- B. 13% per annum
- C. 14% per annum
- D. 15% per annum Discuss
- 5. The simple interest on a certain sum for 3 years at 14% per annum is Rs. 235.20. The sum is?
Options- A. Rs. 480
- B. Rs. 560
- C. Rs. 650
- D. Rs. 720 Discuss
- 6. A sum of money at simple interest amounts to Rs. 2240 in 2 years and Rs. 2600 in 5 years. The sum is?
Options- A. Rs. 1880
- B. Rs. 2000
- C. Rs. 2120
- D. Data inadequate Discuss
- 7. The simple interest at R% for R years will be Rs. R on a sum of?
Options- A. Rs. R
- B. Rs. 100R
- C. Rs. .(100/R)
- D. Rs. (100/R2) Discuss
- 8. At simple interest, a sum doubles after 20 years. The rate of interest per annum is?
Options- A. 5%
- B. 10%
- C. 12%
- D. Data inadequate Discuss
- 9. What annual payment will discharge a debt of Rs. 580 due in 5 years, the rate being 8% per annum?
Options- A. Rs. 166.40
- B. Rs. 65.60
- C. Rs. 100
- D. Rs. 120 Discuss
- 10. Ashok took a loan of Rs. 15000 for 3 years at simple interest . If the total interest paid is Rs. 2700. What is the rate of interest per annum?
Options- A. 18
- B. 5.4
- C. 9
- D. 6 Discuss
Simple Interest problems
Search Results
Correct Answer: 131/3%
Explanation:
Let principal = P
Then, SI = 2P & Time = 15 years
? Required rate = (100 x SI) / (P x T) = (100 x 2P) / (P x 15) = 200/15 = 131/3 per annum
Correct Answer: Rs. 625
Explanation:
S.I for 1 year = Rs. (925 - 850) = Rs. 75
S.I for 3 year = Rs. (75 x 3) = Rs. 225
? Sum = Rs. (850 - 225) = Rs. 625
Correct Answer: Rs. 137.60
Explanation:
S.I on Rs. 64 for 2 year = Rs. 19.20
? Rate = (100 x SI) / (P x T) = (100 x 19.20) / (64 x 2) = 15%
? S.I On Rs. 86 for 4 year = (P x R x T) / 100 = Rs. (86 x 4 x 15 ) /100 = Rs.51.60
? Amount of Rs. 86 after 4 years = Rs. (86 + 51.60) = Rs. 137.60
Correct Answer: 15% per annum
Explanation:
S.I. for 1 year = Rs. (783 - 702) = Rs 81
S.I. for 2 years = Rs. (81 x 2) = Rs. 162
? Sum = Rs. (702 - 162) = Rs. 540
? Required rate = = (100 x SI) / (P x T) = (100 x 162) / (540 x 2) % = 15%
Correct Answer: Rs. 560
Explanation:
Required sum = Rs. (100 x SI ) / ( T x R )
= (100 x 235.20) / (3 x 14)
= Rs. 560
Correct Answer: Rs. 2000
Explanation:
S.I for 3 years = Rs. (2600 - 2240) = Rs . 360
S.I for 2 years = Rs. (360/3 x 2) = Rs. 240
? Required sum = Rs . (2240 - 240) = Rs. 2000
Correct Answer: Rs. .(100/R)
Explanation:
Sum = (100 x SI) / (R x T)
= (100 x R) / (R x R)
= Rs. 100/R
Correct Answer: 5%
Explanation:
Let sum = P, then SI = P and Time = 20 years
? Required rate = (100 x SI)/(P x T) = (100 x P) / (P x 20) = 5% per annum
Correct Answer: Rs. 100
Explanation:
Let the annual installment be Rs. P
Then, [P + (P x 4 x 8)/100] + [P + (P x 3 x 8) / 100] + [P + (P x 2 x 8)/100 ] + [ P + (P x 1 x 8)/100] + P = 580
? 33P/25 + 31P/25 + 29P/25 + 27P/25 + P = 580
? (120 + 25)P = 580 x 25
? P = 100
Correct Answer: 6
Explanation:
? Rate = [(interest x 100) / (Principal x Time) ] %
? Rate = (2700 x 100) / (15000 x 3) %
? Rate = 6%
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