Question $16(0\mathrm{.}5$ points$)$

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At a certain output level, the per$-$unit cost incurred by a firm to manufacture a product was $$70.$ Once the cumulative output doubled, the cost per unit reduc $$63.$ All other factors remaining constant, the firm has been able to achieve a$($n

$80$ percent learning curve.

$90$ percent learning curve.

$60$ percent learning curve.

$54$ percent learning curve.