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

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Manager
Joined: 10 Oct 2018
Posts: 171
Location: United States
GPA: 4
WE: Human Resources (Human Resources)
A sum of money doubles itself in 7 years. In how many years it becomes  [#permalink]

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11 Apr 2019, 06:44
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25% (medium)

Question Stats:

67% (00:27) correct 33% (00:48) wrong based on 15 sessions

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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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Manager
Joined: 21 Feb 2019
Posts: 103
Location: Italy
Re: A sum of money doubles itself in 7 years. In how many years it becomes  [#permalink]

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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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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.

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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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