please provide proper explanation

Use the following to answer questions (21) - (24): A firm operates with the following short-run total cost (TC) equation: TC- 50 + Q, where Q is the quantity produced. [21] At a quantity produced of 10, average fixed cost equals: A. B. C. D. None of the above [22] The marginal cost of the 1 1" unit produced exceeds $1. A. True B. False [23] At a quantity produced of 10, average total cost equals: A. $50 B. $6 C. D. None of the above [24] If average total cost equals $11, then the firm must be producing a quantity equal to: A 11 B. 10 C. 5 None of the above