at the rate of simple interest per annum,the interest on a certain sum of money for 10 years will be 2/5th part of the amount,then the rate of si will be how much

• '.' S.I = PRT/100
  here Time =10 yrs, & S.I =2P/5 for 10 yrs
  
  So, S.I.=PxRx10/100 i.e. 2P/5= 10PR/100
  
  .'. R =(2Px100) / (10Px5) ,i.e. R = 200/50 =4% , .'.The Rate of SI , R = 4%
• 7 years agoHelpfull: Yes(4) No(0)
• Let p=rs x and rate= r
  According to question:
  si= x*2/5=2x/5
  si= p*r*t/100
  2x/5=x*r*t/100
  r=4%
• 7 years agoHelpfull: Yes(2) No(0)
• It says that, After 10 years, the interest constitutes 2/5 of the final amount.
  Mathematically,
  (PRT/100) = 2/5 of (P+(PRT/100))
  Solving the above, we get
  R = 20/3 % = 6 2/3 %
• 5 years agoHelpfull: Yes(1) No(0)