Buffo Company fabricates metal folding chairs. Data concerning the company's revenue and cost structure follow: Selling price per unit $35 Manufacturing cost $3,700 per month plus $16.00 per unit Administrative expense $1,850 per month plus $2.00 per unit Sales commissions 16.00% of sales Advertising expense $7,000 per month If Buffo plans to produce and sell 3,500 units next month, the expected contribution margin would be: a)$39,900 b)$105,650 c)$82,600 d)$35,900