Elsa and her sister watch an opera show every year at Central City Opera. Last year, opera seating cost $85 per ticket. This year, it costs $102. What is the percent increase in the cost of each ticket?
The ticket price increase is $102 - $85 = $
<gadget id="calculator">102-85</gadget>
<output>17</output>
17.
So there is 17/85 x 100% = 20% increase of price.

<result>20</result>