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 regularly 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?
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A7y - 2x
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B12x - 7y
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C$$\frac{9x+12y}{2}$$
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D7y+4x
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E7y+5x
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正确答案: A