At a Certain Output Level,the Per-Unit Cost Incurred by a Firm

Multiple Choice

At a certain output level,the per-unit cost incurred by a firm to manufacture a product was $60.Once the cumulative output doubled,the cost per unit reduced to $54.All other factors remaining constant,the firm has been able to achieve a(n)

A) 80 percent learning curve.
B) 90 percent learning curve.
C) 60 percent learning curve.
D) 54 percent learning curve.