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# If an investment of P dollars is made today and the value of the inves

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Math Expert
Joined: 02 Sep 2009
Posts: 56307
If an investment of P dollars is made today and the value of the inves  [#permalink]

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15 Jul 2018, 08:43
00:00

Difficulty:

35% (medium)

Question Stats:

69% (00:50) correct 31% (01:07) wrong based on 44 sessions

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If an investment of P dollars is made today and the value of the investment doubles every 7 years, what will be the value of the investment, in dollars, 28 years from today?

A. 8P^4
B. P^4
C. 16P
D. 8P
E. 4P

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If an investment of P dollars is made today and the value of the inves  [#permalink]

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Updated on: 15 Jul 2018, 10:42
Bunuel wrote:
If an investment of P dollars is made today and the value of the investment doubles every 7 years, what will be the value of the investment, in dollars, 28 years from today?

A. 8P^4
B. P^4
C. 16P
D. 8P
E. 4P

+1 for C.

Investment Today = P
+ 7 years = P*2 = 2P
+ 14 years = P*2*2 = 4P
+ 21 years = P*2*2*2 = 8P
+ 28 years = P*2*2*2*2 = 16P

Hence, C.
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Originally posted by sudarshan22 on 15 Jul 2018, 09:42.
Last edited by sudarshan22 on 15 Jul 2018, 10:42, edited 1 time in total.
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Re: If an investment of P dollars is made today and the value of the inves  [#permalink]

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15 Jul 2018, 10:38
Bunuel wrote:
If an investment of P dollars is made today and the value of the investment doubles every 7 years, what will be the value of the investment, in dollars, 28 years from today?

A. 8P^4
B. P^4
C. 16P
D. 8P
E. 4P

Note :

1. Investment become doubles in every 7 years.

2. Total time span = 28 years . So, this doubling activity will occur for 4 times.

Workings :

Doubling activity can expressed as follows:

(2)^4 = 16

Initial Balance = p

Total value of the investment = p*(2^4) = 16p

Re: If an investment of P dollars is made today and the value of the inves   [#permalink] 15 Jul 2018, 10:38
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