8.4 Harris Company manufactures a single product. Costs for the year 2015 for output levels of 1,000 and 2,000 units are given in Table P8.4 . At each level of output, compute the following: a. Total manufacturing costs. b. Manufacturing costs per unit. c. Total variable costs. d. Total variable costs per unit. e. Wotal costs that have to be recovered if the firm is to make a profit