Benjamin Company had the following results of operations for the past year: Sales (20,000 units at $10.00) Variable costs Direct materials Directlabor Overhead Contribution margin Fixed costs Fixed overhead $200,000 40,000 80,000 4,000 76,000 16,000 Fixed selling and administrative expenses 40,000 Income $20,000 Aforeign company (whose sales will not affect Benjamin's market) offers to buy 5,000 units at $7.50 per unit, In addition to variable costs, selling these units would increasse fixed overhead by $750 and fixed selling and administrative costs by $375. Assuming Benjamin ha increase by $7,500. ncrease by $5,375 ncrease by $6,500. Decrease by $7,500