Hello, please could you provide step-by-step solutions to the following questions:

18) 19) If a company has a cost curve of TC 300 + 2Q + (22 and it produces 300 units per day, then its marginal cost is: A) $1.00. B) $600. C) $602. D) $2.02. If a company has a cost curve of TC 300 + 2Q + (22 and it produces 300 units per day, then its average (total) cost is: A) B) C) D) $1.00. $303' $300. $602.