Use the Figure the Net Loss to Society Due to the Overproduction

Multiple Choice

Use the figure The Net Loss to Society Due to the Overproduction of a Good. What is the correct way to calculate the area of the shaded triangle in this graph?
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Figure: The Net Loss to Society Due to the Overproduction of a Good

A) $25 × $23
B) $15 × $23
C) ($25 - $15) × ($27 - $23)
D) [($25 - $15) × ($27- $23) ] / 2