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M07 #25

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M07 #25 [#permalink] New post 14 Nov 2010, 17:11
If 40% of unsuccessful requests for promotion are repeated within 6 months and 25% of requests for promotion are successful, what percentage of requests for promotion in any 6 month period would be the first attempt?

A. 30
B. 40
C. 50
D. 60
E. 70





This question doesn't make sense to me.
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Re: M07 #25 [#permalink] New post 15 Nov 2010, 05:43
70%

25% ---> successful promos

60% of 75% ----> unsuccessful promos not repeated

1/4 + 3/5 * 3/4 = 14/20 = 70%
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Re: M07 #25 [#permalink] New post 15 Nov 2010, 09:08
If 40% of unsuccessful requests for promotion are repeated within 6 months and 25% of requests for promotion are successful, what percentage of requests for promotion in any 6 month period would be the first attempt?

A. 30
B. 40
C. 50
D. 60
E. 70

--------------------------------------------------------------------------------------------------------------ans) suppose there are 100 requests in a month :: 100=successful+ unsuccessful
25% of requests for promotion are successful= 25 ppl..
remaining (100-25) are unsuccessful and 40% of 75 ppl is repeated so tht means rest 60% is not repeated
so 60%=3/5 *75=45 ppl
so 45+25=70 ans..
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Re: M07 #25   [#permalink] 15 Nov 2010, 09:08
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M07 #25

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