please need answers to these questions

88 . A monopolist can sell 10 lunchboxes if he or she charges $10 per lunchbox and 11 lunchboxes if he or she charges $9. The MR from selling the 1 1th lunchbox is a. -$1. b. $1. c. $9. d. $99. 89. Which of the following can serve as an entry barrier? a. Legal restrictions b. Patents c. Control of scarce resources or inputs d. All of these responses are correct. TR TC 8 95 90 9 102 93 10 1 10 100 112 105 12 115 110 90. In Table above, the MC of the last unit produced at the profit-maximizing output is a. $5. b. $7 . c. $8. d. $10. 91. Which of the following will occur if a natural monopoly is broken into two smaller firms? a. The price will drop. b. Industry output will increase. c. Production costs will increase. d. Industry output will decrease