A firm manufactures hard disk drives and sells them for $107 each. Each drive requires raw materials costing $24. The number of units sold and total wages bill (including full-time and casual staff) for each of the last 6 months are as follows. Which of the following is the best estimate of the fixed component of this semi-fixed wages cost? Jul Aug Sep Oct Dec Nov 26 39 29 Sales 40 38 37 1479 1869 1571 1809 1900 1840 Wages Select one a. $850 b. $700 . c. $650 x d. $600