Answer:
A) Total revenue = 400 loaves of bread x $2 per loaf of bread = $800
B) Total economic costs = (5 units of labor x $40 per unit of labor) + (7 units of land x $60 per unit of land) + (2 units of capital x $60 per unit of capital) + (1 unit of entrepreneurial ability x $20 per unit) = $200 + $420 + $120 + $20 = $760
C) Economic profit or loss = total revenue - total economic costs = $800 - $760 = $40