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Non Standard Word problems

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Newbie | Next Rank: 10 Posts
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by H287 » Fri Oct 30, 2009 1:50 pm
How does one approach a word problem like the below? Its from MGMAT CAT.
Pls. suggest..

Thanks!

As a bicycle salesperson, Norman earns a fixed salary of $20 per week plus $6 per bicycle for the first six bicycles he sells, $12 per bicycle for the next six bicycles he sells, and $18 per bicycle for every bicycle sold after the first 12. This week, Norman earned more than twice as much as he did last week. If he sold x bicycles last week and y bicycles this week, which of the following statements must be true?
I. y > 2x
II. y > x
III. y > 3
I only
II only
I and II
II and III
I, II, and III

Ans: D
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by venubab » Wed Nov 04, 2009 2:06 am
1. Take X = 6 Amount = 56

Take Y = 10 Amount = 104>102

Y<2x

3. X=0 Amount=20
Y=3 Amount=38<40
Y=4 Amount=44>40
Y>3

2 and 3
Last edited by venubab on Wed Nov 04, 2009 2:24 am, edited 2 times in total.
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by life is a test » Wed Nov 04, 2009 2:16 am
venubab wrote:II only

1. Take X = 6 Amount = 36

Take Y = 10 Amount = 84>72

Y<2x

3. X=1 Amount=6
Y=3 Amount=18>12
Y=3
total earned = 20 + (6 bikes @6) + (6 bikes @12) + 18 (x-12)

20 is the same regardless of how many bikes he sells. The rate of commission doubles for bikes over 6 (for 6 bikes) so if his earnings doubled its because he sold >3 bikes at the higher rate of commission. To get to the higher rate of mission he must have sold 6 bikes in the first week and >9 bikes in the second week.

hope that helps.
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