A sum of money becomes 2.5 times itself at 12.5% simple interest p.a.
What should be the period of investment to get this much return?
A. 6 years
B. 8 years
C. 12 years
D. 20 years

• C. 12 years
  
  If sum=x and period(years)=t, then at 12.5% simple interest, x+ (x*t*12.5)/100= 2.5x, So t=12
• 8 years agoHelpfull: Yes(25) No(3)
• a. 12 years
  principle=x, amount=2.5x
  S.I= 2.5x-x=1.5x
  put values of S.I and P in formula of S.I=(p*r*t)/100
• 8 years agoHelpfull: Yes(6) No(0)
• (x*12.5*T)/100=2.5x
  T=20 years
• 8 years agoHelpfull: Yes(6) No(8)
• PRINCIPAL -X
  AMOUNT - 2.5X
  SIMPLE INTEREST: A-P = 2.5X-X= 1.5X
  SI = PTR/100
  1.5X = X*T*12.5/100
  T=12 YRS ( Note : he given amount but not simple interest, so 20 yrs is wrong )
• 8 years agoHelpfull: Yes(6) No(0)
• c. 12 years
  
  if sum =9100 and period is T then 12.5% is rate of interest and amount is 250 and SI is 150 so with the formula SI= (p*r*t)/100.
  
  150=(100*12.5*T)/100
  t=12 years
  
• 8 years agoHelpfull: Yes(3) No(1)
• RT=(n-1)*100
  where n=2.5, R=12.5
• 8 years agoHelpfull: Yes(2) No(2)
• P=x, SI=2.5x
  SI=(P*R*T)/100
  2.5x=(x*12.5*T)/100
  T=(2.5x*100)/12.5x
  T=20 yrs
• 8 years agoHelpfull: Yes(2) No(5)
• let the sum of money be X
  and time be t
  using formula
  (p*r*t)/100
  
  (X*12.5*t)/100=2.5X
  12.5Xt=250X
  
  X gets cancle
  
  12.5t=250
  t=2500/125
  so t=20
• 8 years agoHelpfull: Yes(2) No(4)
• option (c) is the correct answer ....simple logic. try to answer from question ..its time taking(if u r calculation is weak) but 100% correct . let us solve
  let us take principle amount be 100
  SI= P*R*T/100
  consider the first option ; 6 years
  100*6*12.5/100=75
  as we know that it get double in 12 years ;150
  150+100(Principle)=2.5 times of it self
• 8 years agoHelpfull: Yes(1) No(0)