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1. Problems and Applications Q1 Crystal can read 30 pages of economics in an hour. She can also read 20 pages of sociology in an hour. She spends 6 hours per day studying. Use the blue line (circle symbol) to draw Crystal's production possibilities frontier (PPF) for reading economics and sociology. 200 180 460 PPF 140 120 100 80 Economics Pages 60 40 20 0 +t +t + + + + + + + 1 0 20 40 60 80 100 120 140 160 180 200 Sociology Pages Crystal's opportunity cost of reading 60 pages of sociology is [| pages of economics