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Maths Puzzle
HR Interview
Interview
In how many years will a sum of money doubles itself at 5% per annum simple interest
Read Solution (Total 4)
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- 20 years
let the initial sum be 10
given 5% interest per annum (0.5 in case of 10)
by these calculations we can summarise it - 12 years agoHelpfull: Yes(8) No(4)
- let the initial sum be x
then,Amount=2x(because sum will be double)
Amount = Principal + S.I
2x = x + s.I
S.I = x
S.I = (p*r*t)/100
x = (x*5*t)/100
therefore,t = 20 years - 12 years agoHelpfull: Yes(8) No(2)
- a simple formula for this type of questions are there
sum=100(t-1)/r
t=2,r=5(given)
sum=100(2-1)/5=20 years - 12 years agoHelpfull: Yes(7) No(1)
- let time is t then interest = (x*5*t)/100 where x is initial amount
and initial sum is to be double interest should be equal to x so
x=(x*5*t)/100
t=20 years - 12 years agoHelpfull: Yes(4) No(2)
self Other Question
Mr. David usually starts at 9:00AM and reaches his office just in time, driving at his regular speed.Last Wednesday, he started at 9:30AM and drove 25% faster than his regular speed. Did he reach theoffice in time?
(1)Last Monday, he started to his office 20 minutes early, drove 20% slower than his regularspeed, and reached his office just in time.
(2)Last Tuesday, he started to his office 10 minutes early, and reached the office 10 minutesearly driving at his regular speed.
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