Decorative Designs produces architectural moldings. Their most popular moldings come in either plastic or plaster. Plastic moldings are made in batches of 677 units, while the batch size of plaster moldings is only 500. The costs for producing batches of the molding are given below: Labor Materials Energy Capital Miscellaneous Plastic $10 $30 $25 $40 $15 Plaster $45 $15 $20 $20 $10 What is the multi-factor productivity for plastic moldings?