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 General Aptitude
 Simple Interest
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  




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 :






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.  


Now, P = Rs. 4500, R = 5%, T = 1 year.  




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.  






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. Oneforth of the first sum is equal to onefifth 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.  




Solving (i) and (ii), we get : x = 1200 and y = 1500.  

