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by GMATGuruNY » Thu Oct 25, 2012 8:44 pm
Of every 4 tickets sold, 3 are $10 regular tickets and 1 is a $6 student ticket:
3(10) + 6 = 36.

30 tickets are sold every 5 minutes.
Thus, in 60 minutes -- 12 times as long -- the number of tickets sold = 12*30 = 360.

Every 4 of these tickets brings in $36.
Thus, the amount earned every hour by 360 tickets = 360/4 * 36 = 90*36 = 3240.

Thus, in the 9 hours between 9 and 6pm, the total earnings = 9*3240 = 29,160.

The correct answer is E.

Please note that the last set of 30 tickets is sold at 5:55pm.
Thus, even in the last hour, a total of 360 tickets are sold.
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by George7 » Thu Oct 25, 2012 9:31 pm
Thanks,
I thought that the first ticket was sold at 9:05 AM, that's why I didn't understand why twelve sets of tickets would be sold from 5 to 5:55 Pm
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