Tickets to a certain concert sell for $20 each. The first 10 people to show up at the ticket booth received a 40% discount, and the next 20 received a 15% discount. If 45 people bought tickets to the concert, what was the total revenue from ticket sales? Pick
A) $600 B) $760 C) $850 D) $980 E) $1,140
Price of 1 ticket = 20$   Revenue generated from sales of first 10 tickets = 10 * (60/100 * 20 )   = 10 * 12= 
<gadget id="calculator">10 * 12</gadget>
<output>120</output>
120   Revenue generated from sales of next 20 tickets= 20 *(85/100 * 20 )   =20*17= 
<gadget id="calculator">20*17</gadget>
<output>340</output>
340   Revenue generated from sales of last 15 tickets= 20 * 15= 
<gadget id="calculator">20 * 15</gadget>
<output>300</output>
300   Revenue generated from sales of 45 tickets= 120 + 340 + 300= 
<gadget id="calculator">120 + 340 + 300</gadget>
<output>760</output>
760 $   Answer $760
<result>B</result>
Tickets to a certain concert sell for $20 each. The first 10 people to show up at the ticket booth received a 40% discount, and the next 20 received a 15% discount. If 45 people bought tickets to the concert, what was the total revenue from ticket sales?