A sum of money becomes 2.5 times itself at 12.5% simple interest p.a. The period of investment is:

• let period=t
  sum=p
  some amount of money becomes 2.5 times after some period
  means 2.5p=p+interest(S.I)
  interest S.I=1.5p
  then S.I=ptr/100
  1.5p=(pt*12.5)/100
  t=12 years
  
• 11 years agoHelpfull: Yes(26) No(2)
• let sum of money be x & invested for t years
  A/Q 2.5*x=(x*12.5*t)/100
  or 2.5*100=12.5*t
  or t=(2.5*100)/12.5=20 years
• 11 years agoHelpfull: Yes(12) No(15)
• 1.5x=x*12.5*t/100 i.e t=12 year
• 11 years agoHelpfull: Yes(12) No(2)
• let principle amount=x
  total amount=2.5x
  then simple interest=2.5x-x=1.5x
  S.I=ptr/100
  1.5x=x*t*12.5/100
  t=12 years
  
  so Answer is 12 years
  
  
• 10 years agoHelpfull: Yes(5) No(0)
• let the principle be p
  simply interst is 2.5p-1p=1.5p
  so si=p*R*t/100
  1.5p=p*r*t/100
  solving ans cmes
  pls dnt give lengthy solutions
• 11 years agoHelpfull: Yes(3) No(0)
• we have direct formula
  T * R = 100(multiple no of principle - 1)
  so t = 100(2.5 -1 )/12.5 = 12 year
• 10 years agoHelpfull: Yes(3) No(0)
• Sorry there is calculation mistake ans is 12 instead of 3.
• 11 years agoHelpfull: Yes(2) No(0)
• (2.5x-x)=(x*12.5*t/100)
  t=3yrs
• 11 years agoHelpfull: Yes(1) No(3)
• I cant understand can u tell me brief
• 10 years agoHelpfull: Yes(0) No(1)
• let p=100
  then 2.5 times of 100=250=amount, so SI= 250-100= 150
  now SI=P*R*T/100 after putting the values we get T=150/12.5= 12
• 10 years agoHelpfull: Yes(0) No(0)
• Ia a sum of money becomes X times in T years at S.I.,, then the rate of interest is given by
  R= 100(X-1)/T
  So applying this formula...the answer will be 12..
• 10 years agoHelpfull: Yes(0) No(0)
• let p is sum
  p+pT*12.5/100=2.5p
  t=12
• 9 years agoHelpfull: Yes(0) No(0)
• 1.5*x=x*12.5*t/100
• 7 years agoHelpfull: Yes(0) No(0)
• rate(r)=12.5% m(times)=2.5
  direct formula will be der:
  time=100(m-1)/r
  100(2.5-1)/12.5
  100*15/125=12
  so answer is 12
• 7 years agoHelpfull: Yes(0) No(0)
• Use this formulae 5) If sum of money becomes (z times) in (T) years at simple interest, then rate of interest (R) can be calculated using the formula:
  Rate of Interest (R) % = 100 (z – 1)
  T
  
  6) If sum of money becomes (z times) at rate of interest (R) % per annum at simple interest, then time (T) can be calculated using the formula:
  Time (T) = 100 (z – 1)
  R
• 7 years agoHelpfull: Yes(0) No(0)