<image>(2014 Autumn • Taiyuan Mid-term) Information Gathering: A city’s sports center will host a celebrity basketball game, and introduces two group ticket purchase plans (let x be the number of tickets purchased and y be the total purchase price in yuan):
Plan 1: The total purchase price relationship is determined by the piecewise linear function indicated in the graph OAB;
Plan 2: After a sponsorship of 8000 yuan, the price for each ticket is 50 yuan.
(1) According to the function graph of Plan 1, answer the following questions:
The total price for purchasing 120 tickets is ____ yuan. For purchasing tickets in excess of 100, the price per ticket is ____ yuan. The function relationship between the total purchase price y (in yuan) and the number of tickets x (within 100) is ____.
(2) The function relationship between the total purchase price y (in yuan) and the number of tickets x in Plan 2 is ____.
Problem Solving:
(3) If 90 tickets are purchased, calculate and compare which of the above plans is more economical?