can i explain like too easy to understand

Ned owns a small electronics repair business. He can either repair iPhones or Samsung phones. If he only repairs iPhones he can repair 16 phones in a day. If he only repairs Samsung phones, he can repair 12 in a day. Drag the endpoints of the line to plot his production possibilities frontier (PPF) on the graph. What is the opportunity cost of Samsung repairs production in terms of iPhone repairs/Samsung repairs? Ned's PPF 3/4 iPhones repaired per day S 00 O 8 10 14 Co 20 CO O Samsung phones repaired per day