Biff had a steady job at the golf course on Saturdays in which he would earn $100. But Biff quit his job to sell hot dogs at the park on Saturdays. This past Saturday he sold 150 hot dogs for $3 each. His expenses were: $80 to rent the hot dog stand, $200 on all of the hot dog ingredients, $20 on napkins and other supplies. QUESTIONS: Calculate these: a) Biff's accounting profits b) Biff's economic profits (You must show your calculations to receive any credit for your answers.)