Your friend Sam has been asked to prepare appetizers for a university reception. She has an unlimited amount of ingredients and 6 hours in which to prepare them. Sam can make 400 mini-sandwiches or 320 servings of melon slices topped with smoked salmon and a dab of sauce per hour. a. Sam's opportunity cost of making one mini-sandwich is (Click to select) > b. Sam's opportunity cost of making one melon appetizer is (Click to select) v . c. Suppose the reception has been postponed, and Sam has an extra 4 hours to prepare. The opportunity cost of making one mini- sandwich is now (Click to select) v d. Suppose the reception has been postponed, and Sam has an extra 4 hours to prepare. The opportunity cost of making one melon appetizer is now (Click to select) . e. Suppose Sam's friend Chris helps by preparing the melon slices, increasing Sam's productivity to 400 mini-sandwiches or 400 melon appetizers per hour. The opportunity cost of making one mini-sandwich is now (Click to select) f. Suppose Sam's friend Chris helps by preparing the melon slices, increasing Sam's productivity to 400 mini-sandwiches or 400 melon appetizers per hour. The opportunity cost of making one melon appetizer is now (Click to select)