In calculating demand elasticity from demand function

How we get 10500

QDG=7500-500(3)+100(60)-50(30)

=10500

How 10500 coming

7,500 ā 500(3) + 100(60) ā 50(30) = 7,500 ā 1,500 + 6,000 ā 1,500 = 10,500.

Iām not sure I understand your question.

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Thanks , There was a mistake in my calculation so not giving correct result