please show working

Question 1 2 marks Microchoice has developed a new home karaoki machine, the HomeKar, and has begun manufacturing and selling it. The company has fixed costs of 40,000 per week. Microchoice is marking and selling 200 HomeKars a week at 350 each, which gives a profit margin (profit per unit) of 100. Show your working. a) Determine the variable cost per Homekar. b) What is the smallest number of HomeKars must Microchoice make each week to ensure a profit