In order to produce 100 pairs of oven gloves, Marcia incurs an average total cost of $2.50 per pair. Marcia’s marginal cost is constant at $10.00 for every pair of oven gloves produced. The total cost to produce 50 pairs of oven gloves is:

a. $250.00
b. $500.00
c. $300.00
d. $200.00