The demand function for commodity X, is QD = 300 - 20P; where P is the price in rupees per unit and QD is the quantity demanded in units per period. Which of the following is the price level at which total revenue of a firm facing this demand function is maximised?
A. 8.0
B. 7.5
C. 10.5
D. 12.5
Answer: Option B

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