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Math Expert V
Joined: 02 Sep 2009
Posts: 58445
If (1 – 1.25)N = 1, then N =  [#permalink]

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3
7 00:00

Difficulty:   5% (low)

Question Stats: 85% (00:34) correct 15% (00:34) wrong based on 1297 sessions

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If (1 – 1.25)N = 1, then N =

(A) −400
(B) −140
(C) −4
(D) 4
(E) 400

Kudos for a correct solution.

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Joined: 08 Sep 2015
Posts: 63
Location: India
Concentration: Marketing, Strategy
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Re: If (1 – 1.25)N = 1, then N =  [#permalink]

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3
n=1/-0.25, so n=-4

Ans: c
GMAT Club Legend  V
Joined: 12 Sep 2015
Posts: 4009
Re: If (1 – 1.25)N = 1, then N =  [#permalink]

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3
Bunuel wrote:
If (1 – 1.25)N = 1, then N =

(A) −400
(B) −140
(C) −4
(D) 4
(E) 400

Kudos for a correct solution.

(1 – 1.25)N = 1
Simplify to get: -0.25N = 1
Rewrite as (-1/4)N = 1
Multiply both sides by -4 to get: N = -4

Cheers,
Brent
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Re: If (1 – 1.25)N = 1, then N =  [#permalink]

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Bunuel wrote:
If (1 – 1.25)N = 1, then N =

(A) −400
(B) −140
(C) −4
(D) 4
(E) 400

Kudos for a correct solution.

$$(1 – 1.25)N = 1$$ --> $$(-0.25)N = 1$$ --> $$N = \frac{1}{-0.25}$$ --> $$N = \frac{1}{-1/4}$$ --> $$N = -4$$
Target Test Prep Representative G
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Joined: 04 Mar 2011
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Re: If (1 – 1.25)N = 1, then N =  [#permalink]

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Bunuel wrote:
If (1 – 1.25)N = 1, then N =

(A) −400
(B) −140
(C) −4
(D) 4
(E) 400

Kudos for a correct solution.

We need to determine the value of N in the equation (1 – 1.25)N = 1.

(1 – 1.25)N = 1

(-0.25)N = 1

(-1/4)N = 1

N = -4

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Re: If (1 – 1.25)N = 1, then N =  [#permalink]

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Bunuel wrote:
If (1 – 1.25)N = 1, then N =

(A) −400
(B) −140
(C) −4
(D) 4
(E) 400

Kudos for a correct solution.

(1 – 1.25)N = 1

Or ($$1$$ – $$\frac{5}{4}$$)N = $$1$$

Or $$\frac{-1}{4}$$N = $$1$$

So, N = - 4

Hence answer will definitely be (C)
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Manager  Joined: 20 Mar 2015
Posts: 54
Re: If (1 – 1.25)N = 1, then N =  [#permalink]

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Bunuel wrote:
If (1 – 1.25)N = 1, then N =

(A) −400
(B) −140
(C) −4
(D) 4
(E) 400

Kudos for a correct solution.

$$1 -$$ $$\frac{125}{100}$$ $$*N$$ = 1

$$-$$$$\frac{25}{100}$$ $$*N$$ = 1

$$N =$$ $$-$$$$\frac{100}{25}$$
$$N =$$ $$- 4$$
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Re: If (1 – 1.25)N = 1, then N =  [#permalink]

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1-1.25 = -.25
n/-4 = 1
cross multiply and you get n = -4
C
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Concentration: Accounting, Finance
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Re: If (1 – 1.25)N = 1, then N =  [#permalink]

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Bunuel wrote:
If (1 – 1.25)N = 1, then N =

(A) −400
(B) −140
(C) −4
(D) 4
(E) 400

Kudos for a correct solution.

As we are deducting 1.25 from 1, ultimate result will be negative. Eliminate D and E. -0..25 is equivalent to 1/4. so ultimate result will be -4.

Thus the best answer is Option C.
Manager  G
Joined: 29 Jun 2018
Posts: 53
Location: India
GPA: 4
Re: If (1 – 1.25)N = 1, then N =  [#permalink]

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Bunuel wrote:
If (1 – 1.25)N = 1, then N =

(A) −400
(B) −140
(C) −4
(D) 4
(E) 400

Kudos for a correct solution.

In this case we have 1-(1.25 is 5/4), so that's going to be -1/4.

the correct answer choice is C.
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Joined: 03 Jun 2019
Posts: 1732
Location: India
Re: If (1 – 1.25)N = 1, then N =  [#permalink]

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Bunuel wrote:
If (1 – 1.25)N = 1, then N =

(A) −400
(B) −140
(C) −4
(D) 4
(E) 400

Kudos for a correct solution.

-.25N=1
N=-4

IMO C

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E-mail : kinshook.chaturvedi@gmail.com Re: If (1 – 1.25)N = 1, then N =   [#permalink] 15 Sep 2019, 05:33
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