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Help with question from the Manhattan Gmat flash cards #20

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rich0504
 Post subject: Help with question from the Manhattan Gmat flash cards #20
 Post Posted: Thu Oct 28, 2010 4:13 pm 
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Course Students


Posts: 1
Question #20 on the manhattan gmat flash cards. Carla earns a base salary of 30,000 plus 10% commission.........

I am stuck on the solution. The answer states that c= 0.1(r-50,000) which i get.

But from the statement: "if her total sales revenue had been 25% higher, her commission would have been 20% higher.

Then you guys rephrased that statement to read:
1.2c= 0.1(1.25r-50,000)

Where dose the 1.2c come from? Also where do you get 1.25r?

Please help...
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mschwrtz
 Post subject: Re: Help with question from the Manhattan Gmat flash cards #20
 Post Posted: Thu Oct 28, 2010 8:33 pm 
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ManhattanGMAT Staff


Posts: 506
Where dose the 1.2c come from?

1.2c=120%c=her commission if it had 20% greater

Also where do you get 1.25r?

1.25r=125%r=her sales revenue if it had been 25% greater
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