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:

A sum fetched a total simple interest of Rs 1200 at the rate of 7.5%/yr in 4 years. What is the sum (in Rs)?

A) 4000 B) 6000
C) 8000 D) 7500
 
Answer & Explanation Answer: A) 4000

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Q:

There is 40% increase in an amount in 10 years at simple interest. What will be the compound interest of Rs. 30000 after 3 years at the same rate?

A) Rs 3745.92 B) Rs 7491.84
C) Rs 9364.8 D) Rs 5618.88
 
Answer & Explanation Answer: A) Rs 3745.92

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Q:

Find the simple interest on Rs. 50 for 6 months at the rate of 10 paise per rupee per month.

A) Rs.35 B) Rs.40
C) Rs.25 D) Rs.30
 
Answer & Explanation Answer: D) Rs.30

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Q:

For what sum will the simple interest at R% for 2 years will be R?

A) 100/2R B) 50/R
C) 100/R D) 200/R
 
Answer & Explanation Answer: C) 100/R

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Q:

If the time increases by 7 years, then simple interest increases by Rs 8400 on a sum of Rs 6000. What is the rate (in percentage) of interest per annum?

A) 18 B) 12
C) 20 D) 24
 
Answer & Explanation Answer: C) 20

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Q:

Simple interest on a certain sum of money for 3 years at 14% per annum is half the compound interest on Rs. 10000 for 2 years at 10% per annum. The sum placed on simple interest is

A) Rs 5000 B) Rs 1250
C) Rs 2000 D) Rs 2500
 
Answer & Explanation Answer: D) Rs 2500

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Q:

Simple interest on a certain sum of money for 3 years at 10% per annum is half the compound interest on Rs 6000 for 2 years at 10% per annum. The sum placed on simple interest is

A) Rs 4200 B) Rs 2100
C) Rs 1680 D) Rs 1050
 
Answer & Explanation Answer: B) Rs 2100

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Q:

A sum becomes Rs 1392 in 2 years and Rs 1488 in 3 years at simple interest. What is the rate (in percentage) of interest per annum?

A) 8 B) 10
C) 12 D) 8.5
 
Answer & Explanation Answer: A) 8

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