The principal of the interest compounded at the rate of 10%p.a for 2 years is Rs 420 is

• r = 10%
  n = 2 years
  CI = 420
  p(1 + r/100)^n - p = 420
  
  p(1 + 10/100)^2 - p = 420
  121p/100 - p = 420
  21p = 42000
  p = 42000/21
  p = 2000
  
  Ans : 2000 Rs
  
  
  
  
• 10 years agoHelpfull: Yes(16) No(0)
• Rs 2000
  
  CI = A - P , where CI-->compound interest, A-->amount, P--->principal
  CI=P(1+r/100)^n -P
  
  420 = P[ (1+10/100)^2 - 1]
  420 = P*[21/100]
  
  P = 420*100/21
  =Rs 2000
  
• 10 years agoHelpfull: Yes(3) No(0)