TC, TR, variable costs formulas please!!

Tina, a business student wants to set up a business completing tax forms. her price would be $50 for each job. fixed expenses include $395 for the purchase of tax software. which tina would purchase. tina would hire some accounting students to complete the forms paying them for two hours at $12 per hour per each job. she would also have paper and supplies costs of $5 per job. how many jobs would she have to generate before she starts to make a profit?