A sum of money was lent for 2 years at 20% compounded annually. If the interest is payable half-yearly instead of yearly, then the interest is Rs. 482 more. Find the sum.
Given,
Rate of interest = 20% p.a = 
Time = 2 years = 
Let principal = Rs. P
According to the question,
= 
= 
= 
Hence,
Principal = Rs.20000
20