Please explain and show work

21. The attached article titled "The Hidden Rot in the Jobs Numbers" describes how the Affordable Care Act encourages businesses to have fewer than 50 full-time employees [with full-time defined as 30 hours per week] to avoid having to provide health insurance. To avoid complications, assume there is a firm that only hires employees full time. The firm pays wages of $200 per day and rents capital for $100 per day. If the firm employs 50 or more employees, its wages including health insurance will increase to $250 per day. Which of the plots shown below would represent the firm's $15,000 isocost line? 150 125 Isocost A n 100 S 75 50 25 K 5 10 15 20 30 Units of L 35 40 45 50 55 60 a. 150 Isocost B 125 n 100 t 75 f 50 K 25 10 15 20 25 30 35 40 45 50 55 60 b. Units of L\f\f