According to the law of supply, assuming other factors are held constant .a. as the price of milk increases, the quantity of milk purchased by consumers will decrease. b. as the price of milk decreases, the quantity of milk supplied will decrease. c. as the price of milk increases, the quantity of milk supplied will decrease. d. as the supply for milk increases, the price of milk will also increase.

Atennis club charges a monthly membership fee of $150 and charges it members $10 per hour to use a court. there's also $500 fee to become a member. stella joined the tennis club last spring, and she has been a member for 5 months. she has been playing 10 hours of tennis each month. stella values an hour of her time at $20. during a boring afternoon meeting, stella thinks about reserving a court to work on her serve for an hour tonight. what's stella's opportunity cost of working on her serve for an hour?