The answer is c. $112,000. The quickest way to arrive at this answer is to notice that 12,000 is a 20% increase over 10,000. Fixed costs remain the same, so the flexible budge for 12,000 units is (96,000 - 16,000)*.2 +96,000 = 112,000. A better way, or at least more generalizable, way to approach the problem is to calculate and sum the per unit cost for each variable factor, multiply that by the number of units, and then add the fixed costs. So: [(material/unit + labor/unit + variable overhead/unit) x units] + fixed overhead = cost