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51.
A sum of money doubles in 8 years. In how many years, it will treble at S.I.
- A.4
- C.12
- B.8
- D.16
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| Here P is the same | |||||||||
| A simple ratio will give the Time | |||||||||
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| i.e., In 16 years, the amount will treble | |||||||||
52.
A sum was put a simple interest at a certain rate for 2 years. Had it been put at 3% higher rate, it would have fetched Rs. 72 more. The sum is:
- A.Rs. 1200
- C.Rs. 1600
- B.Rs. 1500
- D.Rs. 1800
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
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53.
The interest on a certain deposit at 4.5% per annum is Rs. 202.50 in one year. How much will the additional interest in one year be on the same deposit at 5% per annum?
- A.Rs. 20.25
- C.Rs. 25
- B.Rs. 22.50
- D.Rs. 42.75
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| S.I. = Rs. 202.50, R = 4.5%, T = 1 year. | ||||||||||||
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| Now, P = Rs. 4500, R = 5%, T = 1 year. | ||||||||||||
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54.
A sum of money amounts to Rs. 9800 after 5 years and Rs. 12005 after 8 years at the same rate of simple interest. The rate of interest per annum is :
- A.5%
- C.12%
- B.8%
- D.15%
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| S.I. for 3 years = Rs. (12005 - 9800) = Rs. 2205. | ||||||||||
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55.
A man invests a certain sum of money at 6% per annum simple interest and another sum at 7% per annum simple interest. His income from interest after 2 years was Rs. 354. One-forth of the first sum is equal to one-fifth of the second sum. The total sum invested was :
- A.Rs. 2600
- C.Rs. 2880
- B.Rs. 2700
- D.Rs. 2900
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| Let the sums be x and y. | ||||||||||||
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| Solving (i) and (ii), we get : x = 1200 and y = 1500. | ||||||||||||
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