Answer:
b. $22.
Explanation:
Calculation to determine what The marginal revenue for the firm over this range is
Marginal revenue=(60* $10) -(64*$8) / (64-60)
Marginal revenue=(60 * $10) -(64*$8) / 4
Marginal revenue=$600-$512/4
Marginal revenue=$88/4
Marginal revenue=$22
Therefore The marginal revenue for the firm over this range is $22