Labour Hired 4 6 Resulting Output Table 1 4 10 18 24 28 30 28 18. Refer to Table 1. Assume labour is variable in the short run and the wage rate does not depend on quantity produced. Over what range of output will this firm achieve its lowest marginal cost? a) Units 5 through 10. b) Units 11 through 18. c) Units 19 through 24. d) Units 25 through 28. e) Units 29 through 30.