Latest Elitmus Aptitude Question SOLUTION: a sum of money lent out a simple interest doubled itself in 20 years. in how many years will it treble itself? option a)none b)40 c)30 d)50

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(#M40024670) ELITMUS Numerical Ability question Keep an EYE

a sum of money lent out a simple interest doubled itself in 20 years. in how many years will it treble itself?
option
a)none
b)40
c)30
d)50

Asked In Elitmus ajay namdev (11 years ago)

Unsolved Read Solution (6)

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Read Solution (6) :

Devendra Marghade  (11 years ago)

b) 40
If Sum=x,interest rate=r,t=20 then, x*20*r/100=x , r=5
To triple the amount x*t*5/100=2x, t=40

Is this solution Helpfull? Yes (15) | No (5)  

pranov bais  (11 years ago)

here sum is doubles in 20 years =>
consider sum = x and si = 2x now put values in formula we get r = 10%
now to triple the sum consider sum = x , si = 3x , r = 10% and again put values in the fromula(si = (sum*r*t)/100) we get t = 30 years
please correct me if a am wrong
answer=>b)30

Is this solution Helpfull? Yes (6) | No (13)  

Amardip Gautam  (11 years ago)

a/c, (p*r*20)/100 = 2p
=>r = 10
therfore,(p*10*t)/100 = 3p
=> t = 30 years

Is this solution Helpfull? Yes (3) | No (2)  

hareesh  (11 years ago)

c)30 interest=10%

Is this solution Helpfull? Yes (2) | No (2)  

Ritesh Tiwari  (11 years ago)

40
100(n-1)=rt
100/20=t
t=5
therefore t=100*2/5
=40(ans)

Is this solution Helpfull? Yes (2) | No (1)  

rishab kumar  (6 years ago)

(n - 1) x 100 = rt

In the first part of given problem n = 2 & t = 20

Plugging values, (2 - 1) x 100 = r x 20

=> r = 5%

For the second part of problem, plug in newly obtained values of r and n = 3 :

(3 - 1) x 100 = 5 x t

t = 200/5= 40 years.

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