Compound Interest Questions

FACTS  AND  FORMULAE  FOR  COMPOUND  INTEREST  QUESTIONS

 

 

Let Principal = P, Rate = R% per annum, Time = n years.

I.

1.  When interest is compound Annually:

Amount =P1+R100n

2.  When interest is compounded Half-yearly:

Amount = P1+(R2)1002n

3.  When interest is compounded Quarterly:

Amount = P1+R41004n

 

II.

1.  When interest is compounded Annually but time is in fraction, say 325 years.

Amount = P1+R1003×1+25R100

2.  When Rates are different for different years, say R1%, R2%, R3% for 1st, 2nd and 3rd year respectively.

Then, Amount = P1+R11001+R21001+R3100

 

III.  Present worth of Rs. x due n years hence is given by:

Present Worth = x1+R100n

Q:

A bank offers 20% compound interest per half year. A customer deposits Rs 6000 each on 1st January and 1st July of a year. At the end of the year, the amount he would have gained by way of interest is

A) Rs 7680 B) Rs 3840
C) Rs 1920 D) Rs 960
 
Answer & Explanation Answer: B) Rs 3840

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Q:

Find the compound interest on Rs. 62500 at 21% per annum for 1.5 years.

A) Rs. 20695 B) Rs. 19687.5
C) Rs. 20687.5 D) Rs. 21638.5
 
Answer & Explanation Answer: C) Rs. 20687.5

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4 811
Q:

If the amount received at the end of 2nd and 3rd year at compound Interest on a certain Principal is Rs 9,600 and Rs 10,272 respectively, what is the rate of interest (in %)?

A) 7 B) 8
C) 6 D) 5
 
Answer & Explanation Answer: A) 7

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2 809
Q:

A bank offers 20% compound interest calculated on half year basis. A customer deposits Rs 9200 each on 1st January and 1st July of a year. At the end of the year, the amount he would have gained by way of interest is

A) Rs 11776 B) Rs 2944
C) Rs 1472 D) Rs 5888
 
Answer & Explanation Answer: D) Rs 5888

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2 809
Q:

The difference between the compound interest (compounding annually) and simple interest on a sum at the rate of 12% per annum for 2 years is Rs 360. What is the sum (in Rs)?

A) 27000 B) 32000
C) 30000 D) 25000
 
Answer & Explanation Answer: D) 25000

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9 807
Q:

What is the difference (in Rs) between compound interest (compounded annually) and simple interest for 3 years on a principal of Rs 3000 at the annual rate of 20%?

A) 464 B) 384
C) 356 D) 424
 
Answer & Explanation Answer: B) 384

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1 797
Q:

The difference between simple and compound interests compounded annually on a certain sum of money for 2 years at 5% per annum is Rs 45. The sum is

A) Rs 36000 B) Rs 72000
C) Rs 18000 D) Rs 54000
 
Answer & Explanation Answer: C) Rs 18000

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2 789
Q:

There is 40% increase in an amount in 8 years at simple interest. What will be the compound interest of Rs. 36000 after 2 years at the same rate?

A) Rs 6150 B) Rs 7687.5
C) Rs 3690 D) Rs 4612.5
 
Answer & Explanation Answer: C) Rs 3690

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