Major E. has just opened a cooking school focusing on basic meals for new cooks. Each student pays $15 per class and receives all the ingredients necessary to prepare dinner using the recipes demonstrated in the class. Majors cost to provide the ingredients is $6 per student. In order to give his students hands-on help, Major employs two assistants and pays each of them $1,200 per month. Majors monthly salary is $1,800. The depreciation on equipment is $1,000 per month and utilities and insurance are $240 per month. What is Majors unit contribution margin?