Team owners have also boosted ticket prices at the new parks, charging about 35 percent more than they did at the old parks.
Ticket prices at the new parks have been raised by around 60% on average. 
mnli hypothesis: Ticket prices at the new parks have been raised by around 60% on average.  premise: Team owners have also boosted ticket prices at the new parks, charging about 35 percent more than they did at the old parks.