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A sum of money doubles itself in 7 years. In how many years it becomes

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A sum of money doubles itself in 7 years. In how many years it becomes  [#permalink]

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New post 11 Apr 2019, 06:44
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A sum of money doubles itself in 7 years. In how many years it becomes four fold?
(A) 14 years
(B) 21 years
(C) 28 years
(D) 35 years
(E) 49 years

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Re: A sum of money doubles itself in 7 years. In how many years it becomes  [#permalink]

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New post 11 Apr 2019, 07:09
\(n\) at \(t= 0\).

\(2n\) at \(t = 7\).

\(2*2n = 4n\) at \(t =14\).
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Re: A sum of money doubles itself in 7 years. In how many years it becomes  [#permalink]

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New post 14 Apr 2019, 18:45
nm97 wrote:
A sum of money doubles itself in 7 years. In how many years it becomes four fold?
(A) 14 years
(B) 21 years
(C) 28 years
(D) 35 years
(E) 49 years


If the initial amount of money is x dollars, then 7 years later, it will be 2x dollars, and in another 7 years, it will be 4x dollars. Thus, it takes 14 years to quadruple the initial amount money.

Answer: A
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Re: A sum of money doubles itself in 7 years. In how many years it becomes   [#permalink] 14 Apr 2019, 18:45
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