 Let Principal = P, Rate = R% per annum, Time = n
 When interest is compound Annually:
 When interest is compounded Halfyearly:
Amount = P 

1 + 
(R/2) 

2n 
100 
 When interest is compounded Quarterly:
Amount = P 

1 + 
(R/4) 

4n 
100 
 When interest is compounded Annually but time is in fraction, say 3
Amount = P 

1 + 
R 

3 
x 

1 + 
R 

100 
100 
 When Rates are different for different years, say R_{1}%, R_{2}%, R_{3}% for 1^{st}, 2^{nd}and 3^{rd} year respectively.
Then, Amount = P 

1 + 
R_{1} 


1 + 
R_{2} 


1 + 
R_{3} 

. 
100 
100 
100 
 Present worth of Rs. xdue n years hence is given by:
 A bank offers 5% compound interest calculated on halfyearly basis. A customer deposits Rs. 1600 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:
 Rs. 120
 Rs. 121
 Rs. 122
 Rs. 123
 The difference between simple and compound interests compounded annually on a certain sum of money for 2 years at 4% per annum is Re. 1. The sum (in Rs.) is:
 625
 630
 640
 650
 There is 60% increase in an amount in 6 years at simple interest. What will be the compound interest of Rs. 12,000 after 3 years at the same rate?
 Rs. 2160
 Rs. 3120
 Rs. 3972
 Rs. 6240
 None of these
 What is the difference between the compound interests on Rs. 5000 for 1 years at 4% per annum compounded yearly and halfyearly?
 Rs. 2.04
 Rs. 3.06
 Rs. 4.80
 Rs. 8.30
 The compound interest on Rs. 30,000 at 7% per annum is Rs. 4347. The period (in years) is:
 2
 212
 3
 4
 What will be the compound interest on a sum of Rs. 25,000 after 3 years at the rate of 12 p.c.p.a.?
 Rs. 9000.30
 Rs. 9720
 Rs. 10123.20
 Rs. 10483.20
 None of these
 At what rate of compound interest per annum will a sum of Rs. 1200 become Rs. 1348.32 in 2 years?
 6%
 6.5%
 7%
 7.5%
 The least number of complete years in which a sum of money put out at 20% compound interest will be more than doubled is:
 3
 4
 5
 6
 Albert invested an amount of Rs. 8000 in a fixed deposit scheme for 2 years at compound interest rate 5 p.c.p.a. How much amount will Albert get on maturity of the fixed deposit?
 Rs. 8600
 Rs. 8620
 Rs. 8820
 None of these
 The effective annual rate of interest corresponding to a nominal rate of 6% per annum payable halfyearly is:
 6.06%
 6.07%
 6.08%
 6.09%