Correct Answer: Option B

Explanation

Q d = 20 - 4P and Q = 6P + 12
Qd = Qs

20 - 4p = 6p + 12
20 - 12 = 8
6p + 4p = 10p
p = 8/10 = 0.8
Substitute '0.8' in Qd equation. Hence we will have

Qd = 20 - 4 (0.8)
Qd = 20 - 3.2 = 16.8

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