If a firm has an inventory turnover of 15, the firm: Multiple Choice sells its entire inventory every 15 days. stocks its inventory only once every 15 days. delivers inventory to its customers every 15 days. sells its inventory by granting customers 15 days' of free credit.

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?