A certain sum of money at simple interest becomes Rs. 1062 in 2 years and Rs. 1183.50 in 31⁄2

years. What is rate of interest per annum?

Op 1: 7%

Op 2: 6%

Op 3: 9%

Op 4: 5% what will be it's answer

• A2=1062
  A3.5=1183.5
  NOW,S.I(1.5 YEARS)=1183.5-1062=121.5
  THEN using unitary method,,, SI FOR(2yrs)=121.5*2/3.5
  =162.
  now amount=P+I....SO PRINCIPAL=1062-162=900
  =>900*R*2/100 =162.
  R=9% pa.
• 6 years agoHelpfull: Yes(3) No(3)
• 3) 9%
  
  Let the sum=Rs x and rate%= r, then
  Sum after 2 years = x + x*r*2/100 = 1062 ----(i) and
  Sum after 3 1/2 or 7/2 years = x + x*r*(7/2)/100 = 1183.5 ----(ii)
  Subtracting (i) from (ii), 7xr/200 - 2xr/100 = 121.5
  => 3xr = 24300 or xr=8100
  Substituting value of xr=8100 in (i), x + 8100*2/100 = 1062 => x = 1062 - 162 = 900
  So r= 8100/900= 9
• 7 years agoHelpfull: Yes(0) No(1)