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Suppose your school plans a musical. The directors goal is ticket sales of at least $4500. Adult tickets are $7.50 and student tickets are $5.00. Let a represent of adult tickets and a represents the number of student tickets. Which inequality represents the director's goal?
A)5a+7.5s<4500
B)7.5+5s>4500
C)7.5+5s<_(less or equal)4500
D)7.5a+5s>_(greater or equal)4500