Answer:
The marginal cost in dollars of producing widgets is $1
Step-by-step explanation:
If the total cost (TC) of producing 100 widget on Monday is $100 and the total cost of producing 105 widget on Tuesday is $105, the marginal cost (MC) of producing the widgets is
Marginal cost widgets = Change in TC / Change in Widget produced
MC = $105 - $100 / 105 - 100
MC = $5/5
MC = $1