profit and loss : GMAT Quantitative Section

profit and loss

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profit and loss [#permalink]

30 Mar 2012, 07:54

Hello

Can some one help with this sum please.

a teacher's salary was $4400 after an increase of 10%. what would her salary have been if he had receive an increase of 15%.

how do you work this ...

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Re: profit and loss [#permalink]

30 Mar 2012, 08:36

Quote:

Hello

Can some one help with this sum please.

a teacher's salary was $4400 after an increase of 10%. what would her salary have been if he had receive an increase of 15%.

how do you work this ...

Salary prior to 10% increase = x

so 1.1x = 4400

solving for x,
x= 4000

Question is asking for 1.15x

1.15x = 4600

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Re: profit and loss [#permalink]

30 Mar 2012, 09:09

wait how you got 1.1 not following

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Re: profit and loss [#permalink]

30 Mar 2012, 09:13

I got 1.1=4000
but if x=1.15
1.15x=4000
x=4000/1.15
x=3478

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Re: profit and loss [#permalink]

02 Apr 2012, 21:18

SmileyKing wrote:

Hello

Can some one help with this sum please.

a teacher's salary was $4400 after an increase of 10%. what would her salary have been if he had receive an increase of 15%.

how do you work this ...

Let me see if I can break this out into some steps:

You know what the teacher's salary is after a 10% increase. What you need to solve for is the teacher's salary before the 10% increase. So the equation is set up like this:

(1.10)(x) = $4400, where x=teacher's salary before the 10% increase

Solving for x, you get x = $4000

Now the question asks for what the teacher's salary is after a 15% increase. At this point you know the original salary (solved above), so the equation looks like:

New Salary = (1.15)(4000)
New Salary = $4600

You used the equation 1.15x = $4000, which is saying that a 15% increase to the salary of x is $4000. You have your terms mixed up.

Re: profit and loss [#permalink] 02 Apr 2012, 21:18

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