es 1 and 2. Overhead is applied to work in process on the basis of direct labour costs. Question 3 - Cost Behaviour: Analysis and Use (12 marks) A law firm provided legal services to 400 clients last year. Its total variable costs were $350,000 while total fixed costs totalled $500,000. Assume a relevant range of 300 to 600 clients, estimate a) to !): Clients served in a year 500 600 Total costs: Variable costs (a) (9) Fixed costs (h) Total costs (C) (1) Cost per client: Variable cost Fixed cost : ( K ) Total cost per (1) client