Consider the following chart. What is the marginal product of labor $($MPL$)$ of the third worker?

$\backslash$table$[[\backslash$table$[[$Land$],[(20],[$Acres$)],[(1)]],\backslash$table$[[$Labor$],[($Workers$)],[(2)]],\backslash$table$[[$Total$],[$Product$],[($Pounds$)],[(3)]],\backslash$table$[[$Marginal$],[$Product of$],[$Labor $($MPL$)],[(4)]]],[\backslash$table$[[20],[$acres$]],0,0,-],[\backslash$table$[[20],[$acres$]],1,50,+50],[\backslash$table$[[20],[$acres$]],2,130,+80],[\backslash$table$[[20],[$acres$]],3,220,],[\backslash$table$[[20],[$acres$]],4,300,+80],[\backslash$table$[[20],[$acres$]],5,370,+70],[\backslash$table$[[20],[$acres$]],6,390,+20],[\backslash$table$[[20],[$acres$]],7,380,-10]]$

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