I need help with the table and understanding VMRP

5: a. Use the data in table below for firm A and fill in all the blanks. (7.5 points) (1] (2] (3) (4) (5) (6) Units of Total Quantity Price of the Marginal Product $ Total Revenue $ Value of Marginal labor of Output product of labor (MPL] (TR] Revenue Product (VMRP) D 0 $30 N/A N/A 40 $30 72 $30 92 $30 102 $30 107 $30 b. Explain, in your own words, why VMRP declines as more labor is added. Shouldn't it increase as more labor is added to production process? (5.5 points)