For a certain art exhibit, a museum sold admission tickets to a group of 30 people every 5 minutes from 9:00 in the morning to 5:55 in the afternoon, inclusive. The price of a regular admission ticket was $8 and the price of a student ticket was $4. If on one day 3 times as many regular admission tickets were sold as student tickets, what was the total revenue from ticket sales that day?  Options.
A) $20960	B) $21920	C) $22680	D) $28500	E) $29160
From 9:00 in the morning to 5:55 in the afternoon, inclusive there are 9*12= 
<gadget id="calculator">9*12</gadget>
<output>108</output>
108 five-minute intervals, thus total of 108*30 tickets were sold.   Say x student and 3x regular tickets were sold, then x+3x=108*30 --&gt; x=27*30 and 3x=3*(27*30)=27*90.   Therefore, the total revenue from ticket sales that day was 27*30*4+27*90*8=$22,680.   Answer: $22680.
<result>C</result>
For a certain art exhibit, a museum sold admission tickets to a group of 30 people every 5 minutes from 9:00 in the morning to 5:55 in the afternoon, inclusive. The price of a regular admission ticket was $8 and the price of a student ticket was $4. If on one day 3 times as many regular admission tickets were sold as student tickets, what was the total revenue from ticket sales that day?