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 50 people bought tickets to the concert, what was the total revenue from ticket sales?  Options:
A) $600
B) $740
C) $860
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 20 tickets= 20 * 20= 
<gadget id="calculator">20 * 20</gadget>
<output>400</output>
400   Revenue generated from sales of 50 tickets= 120 + 340 + 400= 
<gadget id="calculator">120 + 340 + 400</gadget>
<output>860</output>
860 $   Answer $860
<result>C</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 50 people bought tickets to the concert, what was the total revenue from ticket sales?