Arithmatical  Compound Interest
Important Facts and Formulae
1. 
Let Principal = P, Rate = R% per annum, Time = n years. 
2. 
When interest is compound Annually: 

Amount = P 

1 + 
R 

^{n} 
100 
3. 
When interest is compounded Halfyearly: 

Amount = P 

1 + 
(R/2) 

^{2n} 
100 
4. 
When interest is compounded Quarterly: 

Amount = P 

1 + 
(R/4) 

^{4n} 
100 
5. 
When interest is compounded Annually but time is in fraction, say 3x2/5 years 

Amount = P 

1 + 
R 

^{3} 
100 
x 

1 + 
2/5 x R 


100 
6. 
Present worth of Rs. x due n years hence is given by: 

Present Worth = x / 

1 + 
R 

^{n} 
100 