A firm can hire 20 workers for $10 per hour,but finds it must raise the wage to $11 to attract another worker.If it must pay all its workers the same wage,the marginal wage cost of the 21^st worker is: A)$10 B)$11 C)$21 D)$31

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The marginal wage cost of the 21st worker is the additional cost the firm incurs to hire that worker. Since the firm has to increase the wage from $10 to $11 for all 21 workers to attract the 21st worker, the additional cost is $1 extra per hour for each of the 21 workers ($21), plus the $10 base wage for the 21st worker, totaling $31.

A Firm Can Hire 20 Workers for $10 Per Hour,but