The marginal product of the 12th unit of the factor of production is r '\\ I I \\ J .- \"a If \\ I I \\ r d, \\\\ If \\ I I 2 O \\\\ If I" \\\\ I I \\ J' \\ z Consider the following production and cost schedule for a firm. The first column shows the number of units of a variable factor of production employed by the firm. Total Total Number Number of Price per Unit of Units of Units of the of Output Output Factor 10 20 $10 11 44 $10 12 64 $10 13 78 $10 14 84 $10 15 86 $10The total revenue earned by the rm when it employs 12 units of the factor is 520 640 120 1440 The marginal revenue product of the 14th unit of the factor is 840 140 C3. 60 700