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a.
    Pollution leve (Q)
    Marginal cost (MC )Firm A
    Marginal cost (MC )Firm B
    Total cost firm A

    Total cost firm B
    10
     
     
    0
    0
    9
    1
    2
    1
    2
    8
    2
    7
    1
    5
    7
    3
    13
    2
    8
    6
    5
    17
    3
    9
    5
    7
    25
    4
    16
    4
    10
    36
    6
    20
    3
    13
    49
    7
    29
    2
    17
    61
    10
    32
    1
    21
    88
    11
    56
    0
    25
    124
    14
    68
b.
Cost for the society to reducing pollution level from 10 units to 5 units by each firm = 4+16
Cost for the society to reducing pollution level from 10 units to 5 units by each...