need help on these questions

Question 23 (1 point) Market demand is given as QD = 120 - 2P. Market supply is given as QS = 2P. Each identical firm has MC = 6( and ATC = 3Q. What is a firm's average total cost? O $2 OS8 OSIS Question 24 (1 point) At Bert's Bootery, the total cost of producing 19 pairs of boots is $4000. The marginal cost of producing the 20th pair of boots is $90. What is the average total cost of 21 pairs of boots? O $200 $201.5 $204.50 O $210.52Question 26 (1 point) Market demand is given as QD - 250 - P. Market supply is given as QS = 1.5P. Each identical firm has MC - 100 and ATC - 80. What is a firm's profit? $200 $800 $1000 $1600 Question 27 (1 point) Market demand is given as QD - 110-2P. Market supply is given as QS = 3P + 10. Each identical firm has MC = 10Q and ATC - 50. What is a firm's average total cost? $20