Simple Interest Questions

FACTS  AND  FORMULAE  FOR  SIMPLE  INTEREST  QUESTIONS

 

 

1. Principal: The money borrowed or lent out for a certain period is called the principal or the sum.

 

2. Interest: Extra money paid for using other's money is called interest

 

3. Simple Interest (S.I.) : If the interest on a sum borrowed for a certain period is reckoned uniformly, then it is called simple interest.

Let Principal = P, Rate = R% per annum (p.a.) and Time = T years. Then,

(i)  S.I=P×T×R100

(ii)  P=100×S.IR×T ; R=100×S.IP×T and T=100×S.IP×R

Q:

The difference between simple and compound interests compounded annually on a certain sum of money for 2 years at 4% per annum is Rs 8. The sum is ______.

A) Rs 10000 B) Rs 20000
C) Rs 5000 D) Rs 15000
 
Answer & Explanation Answer: C) Rs 5000

Explanation:
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2 1038
Q:

A certain sum of money becomes double of itself in 15 years at a rate of simple interest. In how many years will it become 5 times of itself at the same rate of simple interest

A) 45 B) 37.5
C) 75 D) 60
 
Answer & Explanation Answer: D) 60

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3 1037
Q:

Simple interest on a certain sum of money for 3 years at 18% per annum is half the compound interest on Rs. 9000 for 2 years at 10% per annum. The sum placed on simple interest is:

A) Rs 3500 B) Rs 875
C) Rs 1750 D) Rs 1400
 
Answer & Explanation Answer: C) Rs 1750

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1 1030
Q:

Simple interest on a certain sum of money for 3 years at 8% per annum is half the compound interest on Rs 1200 for 2 years at 10% per annum. The sum placed on simple interest is

A) Rs 525 B) Rs 1050
C) Rs 260 D) Rs 420
 
Answer & Explanation Answer: A) Rs 525

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1 1025
Q:

A sum of money invested for 2 yrs and 9 months at the rate of 8% simple interest per annum became Rs.732 at the end of the period. What was the sum that was initially invested?

A) Rs. 575 B) Rs. 500
C) Rs. 600 D) Rs. 550
 
Answer & Explanation Answer: C) Rs. 600

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6 1020
Q:

Calculate the simple interest if Rs. 1800 is invested for 10 years at a rate of 5% per annum.

A) Rs. 900 B) Rs. 450
C) Rs. 1800 D) Rs. 2700
 
Answer & Explanation Answer: A) Rs. 900

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0 1020
Q:

A sum of Rs 800 becomes Rs 1000 in 2 years at simple interest. What is the per annum rate of interest (in percent)?

 

A) 12.5   B)  25  
C)  8.5   D)  17
 
Answer & Explanation Answer: A) 12.5  

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3 1020
Q:

The Simple Interest(SI) for 16 years on an amount at particular rate is Rs 10000. If the principal is doubled at an interval of every 4 years and the rate is tripled at every such in terval, find the new Simple Interest(SI)

A) 632100 B) 689620
C) 602260 D) 647500
 
Answer & Explanation Answer: D) 647500

Explanation:
Let New SI be X

10000/16 = X/4(1*1+2*3+4*9+8*27)

10000/16=X/4(1+6+36+216)

X=647500

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