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- Question
- Rs. 800 at 5% per annum compound interest will amount to Rs. 882 in?
Options- A. 1 years
- B. 2 years
- C. 3 years
- D. 4 years
- Correct Answer
- 2 years
ExplanationLet time be t years
? 882 = 800( 1 +5/1000)t
? 882/800 = (21/20)t
? (21/20)2 = (21/20)t
? t =2
? Time = 2years - 1. A sum amounts to Rs. 1352 in 2 years at 4% compound interest.The sum is?
Options- A. Rs. 1300
- B. Rs. 1250
- C. Rs. 1260
- D. Rs. 1200 Discuss
- 2. If the compound interest on a certain sum for 2 years at 12.5% per annum is 170, the simple interest is?
Options- A. Rs. 150
- B. Rs. 152.50
- C. Rs. 160
- D. Rs. 162.50 Discuss
- 3. The difference between the compound interest and the simple interest on a certain sum at 5% per annum for 2 years is Rs. 1.50. The sum is?
Options- A. Rs. 600
- B. Rs. 500
- C. Rs. 400
- D. Rs. 300 Discuss
- 4. Ajay takes some loan from Rashmi at the rate of 5% per annum andd after 2 yr, Ajay gave back ? 8800 to Rashmi and this way paid his whole loan. Find the interest by Ajay.
Options- A. ? 825
- B. ? 975
- C. ? 800
- D. ? 850 Discuss
- 5. Rajnish invested certain sum in three different schemes P, Q and R with the rates of interest 10% per annum, 12% per annum and 15% per annum, respectively. If the total interest accrued in 1 yr was ? 3200 and the amount invested in scheme R was 150% of the amount invested in scheme Q. what was the amount invested in scheme Q?
Options- A. ? 8000
- B. ? 9000
- C. ? 5000
- D. ? 3050 Discuss
- 6. The compound interest on Rs. 2800 for 1 1/ 2 years at 10% per annum is?
Options- A. Rs. 441.35
- B. Rs. 436.75
- C. Rs. 434
- D. Rs. 420 Discuss
- 7. If Rs. 7500 are borrowed at compound interest at the rate of 4% per annum, then after 2 years the amount to be paid is?
Options- A. Rs. 8082
- B. Rs. 7800
- C. Rs. 8100
- D. Rs. 8112 Discuss
- 8. A sum amounts to Rs. 3149.29 in 3 years at compound interest. The sum is?
Options- A. Rs. 1500
- B. Rs. 2000
- C. Rs. 2500
- D. Rs. 3000 Discuss
- 9. A sum of money placed at compound interest doubles itself in 5 years. It will amount to eight times itself in?
Options- A. 15 years
- B. 20 years
- C. 12 years
- D. 10 years Discuss
- 10. The compound interest on a certain sum of money for 2 years at 10% per annum is Rs. 420. The simple interest on the same sum at the same rate and for the same time will be?
Options- A. Rs. 350
- B. Rs. 375
- C. Rs. 380
- D. Rs. 400 Discuss
Compound Interest problems
Search Results
Correct Answer: Rs. 1250
Explanation:
Let the sum be P.
Then, 1352 = P(1 +4/100)2
? 1352 = P x 26/25 x 26/25
? P = (1352 x 25 x 25) / (26 x 26) = 1250
? Principal = Rs. 1250
Correct Answer: Rs. 160
Explanation:
Let the principle is P
so compound interest = p x ( 1 + (12.5/100))sup>2 - p = 170
? p x (112.5/100) x (112.5/100) - p = 170
? P [ 12656.25 - 10000 ] = 170 x 10000
? p = (170 x 10000) / 2656.25
Simple interest SI = (P x T x R )/100
= [{(170 x 10000) / 2656.25} x 2 x 12.5] / 100
= 160
Correct Answer: Rs. 600
Explanation:
Let the sum be Rs . 100 then
S.I. = Rs.(100 x 5 x 2/100)= Rs. 10
C.I = Rs. [{100 x (1 + 5/100)2} - 100] = Rs. 41/4
? Difference between C.I and S.I = Rs. (41/4 - 10) = Re. 0.25
? 0.25 : 150 : : 100 : P
? P = (1.50 x 100) / 0.25 = Rs. 600
Correct Answer: ? 800
Explanation:
Here, A = ? 8800, T =2 yr, R = 5%
We know
SI = ART/(100 + RT) = (8800 x 5 x 2) / (100 + 5 x 2)
= (8800 x 10) / 110
= ? 800
Correct Answer: ? 5000
Explanation:
Let a, b and c be the amount invested in schemes P, Q and R, respectively.
Then, according to the question,
[(a x 10 x 1)/100] + [(b x 12 x 1)/100] + [(c x 15 x 1)/100] = 3200
? 10a + 12b + 15x = 320000 .....(i)
Now, c = 240% of b = 12b/5 ....(ii)
and c = 150% of a = 3a/2
? a = 2c/3 = (2/3 x 12/5) b = 8b/5 .....(iii)
From Eqs. (i), (ii) and (iii), we get
16b + 12b + 36b = 320000
? 64b = 320000
? b = 5000
? Sum invested in scheme Q = ? 5000
Correct Answer: Rs. 434
Explanation:
? Final Amount = Rs.[2800 x (1 + 10/100) x (1 +5/100)]
= Rs. [ 2800 x 11/10 x 21/20 ]
= Rs. 3234
? Required C.I. = Rs.(3234 - 2800) = Rs .434
Correct Answer: Rs. 8112
Explanation:
Amount = Rs. 7500(1 + 4/100)2
= Rs. 7500 x 26/25 x 26/25
= Rs .8112
Correct Answer: Rs. 2500
Explanation:
Let P be the principle and R% per annum be rate
Then, P(1 +R/100)3 = 3149.28 .....(i)
and P(1 + R/100)2 = 2916 .....(ii)
on dividing(i) and (ii) we get
? (1 + R/100) = 3149.28/2916
? R/100 = 233.28/2916
? R = 233.28/2916 x 100 = 8%
Now, P(1 + 8/100)2 = 2916
? P x 27/25 x 27/25 = 2916
? P = (2916 x 25 x 25)/(27 x 27)
= Rs. 2500
Correct Answer: 15 years
Explanation:
Let the principal be P and rate be r%.Then
2P = P(1 + r/100)5
? (1 + r/100)5 = 2
Let it be 8 times in t years, then
? 8P = P(1 + r/100)t
? (1 + r/100)t = 8
? (2)3 ? (1 + r/100)15
? t =15 year.
Correct Answer: Rs. 400
Explanation:
Let the principal be P. Then,
? P(1 +10/100)2 - P =420
? P(121 - 100/100) =420
? P = Rs. 2000
? Requared S.I.= Rs.(2000 x 2 x 10)/100
= Rs. 400
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