ten coffee shops. If a coffee shop employs one worker, it can produce 20 lattes per hour (the shop sells only lattes). If it employs a second worker, it can produce 30 lattes per hour.Each coffee shop has exactly the same relationship between the number of workers and the number of lattes it can produce per hour (all shops sell only lattes), and each can sell its lattes for $5 per latte (they are amazing lattes!). In addition to labor, the ingredients cost $4 per latte, but there are no other costs. Twenty workers have the skills necessary to work in this industry. Fifteen have a reservation wage of $8 per hour, and five have a reservation wage of $12 per hour.How many workers are involuntarily unemployed if the minimum wage is 15?