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 48 people bought tickets to the concert, what was the total revenue from ticket sales?	Choose the correct choice from the following answers.
A) $600 B) $820 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 18 tickets= 20 * 18= 
<gadget id="calculator">20 * 18</gadget>
<output>360</output>
360   Revenue generated from sales of 48 tickets= 120 + 340 + 360= 
<gadget id="calculator">120 + 340 + 360</gadget>
<output>820</output>
820 $   Answer $820
<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 48 people bought tickets to the concert, what was the total revenue from ticket sales?