At Bert's Bootery,the Total Cost of Producing 19 Pairs of Boots

Multiple Choice

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

A) $200
B) $201.5
C) $204.50
D) $210.52