Complete the Table Below by Computing the Missing Numbers from Those

Complete the table below by computing the missing numbers from those that are given.
$$\begin{array} { c c c c c } \underline {\text { Q }} & \underline {\text { Fixed Costs } }& \underline {\text { Vanable Costs }} & \underline {\text { Average Cost } }&\underline { \text { Marginal Cost } }\\0 & \$ 20 &\underline {\quad\quad\quad} &\underline {\quad\quad\quad} &\underline {\quad\quad\quad} \\1 & \underline {\quad\quad\quad} & \underline {\quad\quad\quad} &\underline {\quad\quad\quad}& \$ 8 \\2 & \underline {\quad\quad\quad}& 15 & \underline {\quad\quad\quad}& \underline {\quad\quad\quad} \\3 & \underline {\quad\quad\quad}& \underline {\quad\quad\quad}& 13.67 & \underline {\quad\quad\quad} \\4 & \underline {\quad\quad\quad}& \underline {\quad\quad\quad} & \underline {\quad\quad\quad}& 6 \\5 & \underline {\quad\quad\quad} & \underline {\quad\quad\quad}& \underline {\quad\quad\quad} & 7 \\6 & \underline {\quad\quad\quad} & 42 & \underline {\quad\quad\quad}& \underline {\quad\quad\quad}\\7 & \underline {\quad\quad\quad}& 51 & \underline {\quad\quad\quad}& \underline {\quad\quad\quad}\\8 & \underline {\quad\quad\quad} & \underline {\quad\quad\quad}& 10.125 &\underline {\quad\quad\quad}\end{array}$$