A. 1500
B. 1750
C. 9000
D. 7500

Explanation:

9000 + 16 2/3 % of ? = 10500 => 9000 + 50/3 % of ? = 10500

50/(3 * 100) of ? = 1500 => ? = 1500 * 6
? = 9000

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