Use the table to answer the question. Number of Output Total Cost Variable Cost Fixed Cost Workers 5 100 $130 $80 $50 10 180 $210 $160 $50 15 240 $290 $240 $50 20 280 $370 $320 $50 If the cost of labor is the only variable cost that the firm faces, what is the cost incurred by the business for each additional unit of labor? (1 point) O $10 O $16 O $50 O $80