The Following Table Shows the Total Physical Product of Labor

The following table shows the total physical product of labor.Compute the marginal physical product of labor and the marginal revenue product of labor at output prices of $10 per unit and $12 per unit.If labor costs $105 per unit, how much should the firm hire at each price of output?
$\begin{array}{ccccc}\text { Total Physical } & \text { MRP at a } & \text { MRP at a } && \text { Product } \\ \underline {\text { MPP of Labor }} & \underline {\text { Price of } \$ 10 }& \underline {\text { Price of } \$ 12} & \underline {\text { Labor } }& \underline { \text { of Labor }}\\1 & 10& \underline {\quad\quad\quad}& \underline {\quad\quad\quad}& \underline {\quad\quad\quad}\\2 & 22 & \underline {\quad\quad\quad}& \underline {\quad\quad\quad}& \underline {\quad\quad\quad}\\3 & 35 & \underline {\quad\quad\quad}& \underline {\quad\quad\quad}& \underline {\quad\quad\quad}\\4 & 47& \underline {\quad\quad\quad}& \underline {\quad\quad\quad}& \underline {\quad\quad\quad}\\5 & 58 & \underline {\quad\quad\quad}& \underline {\quad\quad\quad}& \underline {\quad\quad\quad}\\6 & 68 & \underline {\quad\quad\quad}& \underline {\quad\quad\quad}& \underline {\quad\quad\quad}\\7 & 77 & \underline {\quad\quad\quad}& \underline {\quad\quad\quad}& \underline {\quad\quad\quad}\\8 & 85& \underline {\quad\quad\quad}& \underline {\quad\quad\quad}& \underline {\quad\quad\quad}\\\end{array}$