Seven friends are planning to attend a concert. If another friend also goes with them, they will get a group discount on their tickets. If the new total price of the tickets with the group discount is the same as the original total price of the tickets without the group discount, how much is the discount?	Options: A) 8.5% B) 12.5% C) 16.5% D) 19.5% E) 21.5%
Let x be the original price of one ticket.   The total original cost is 7x.   The new cost is 8y, where y is the discounted price of one ticket.   7x = 8y   y = 7x/8 = 0.875x which is a discount of 12.5%.   The answer is 12.5%.7 /8= 
<gadget id="calculator">7 /8</gadget>
<output>7/8 = around 0.875</output>
0.875x which is a discount of 12.5%.   The answer is 12.5%.
<result>B</result>
Seven friends are planning to attend a concert. If another friend also goes with them, they will get a group discount on their tickets. If the new total price of the tickets with the group discount is the same as the original total price of the tickets without the group discount, how much is the discount?