On the day of the performance of a certain play each ticket that regularly sells for less than $10.00 is sold for half price plus $0.50, and each ticket that regularl sells for $10.00 or more is sold for half price plus $1.00. On the day of the performance, a person purchases a total of y tickets, of which x regularly sell for $9.00 each and the rest regularly sell for $12.00 each. What is the amount paid, in dollars for the y tickets?