At a certain rate of simple interest per annum the amount due in 3 & 1/2 yrs and 5 & 1/2 yrs are respectively Rs4560 & Rs4840. Find the rate of Simple Interest ?

• sol;
  let the amount p & rate r
  now 4560-p=(p*r*7/2)/100 .....(1)
  4840-p=(p*r*11/2)/100 .....(2)
  by solving the eq. we get the p=4070 and r=3.43
  so the ans is 3.43
• 12 years agoHelpfull: Yes(18) No(0)
• since si=p*T*r/100
  we have 4560-p=7/2 eqn 1
  4840-p=11/2 equ 2
  equ1/equ2 gives p=4070 sub this in 490=(4070*7/2*r)/100
• 12 years agoHelpfull: Yes(1) No(4)