Sarah bakery makes 1000 items a day. Each day Sarah contributes 8 hours to produce those items. If hired, elsewhere Sarah could have earned $250 an hour. The item sells for $15 each. Production does not stop during weekends. If the explicit costs total $150,000 for 30 days, the economic profit for the month equals:
a. $240,000
b. $450,000
c. $300,000
d. $60,000