Bob Toshida Has the Demand Schedule for Dress Shirts Shown

Bob Toshida has the demand schedule for dress shirts shown in the table below.
A)His total utility from three shirts would be ____.
B)His marginal utility from the fourth shirt would be ____.
C)If the price were $3,his consumer surplus would be ____.
$$\begin{array} { | c | c | c | c | } \hline \text { Price } & \text { Quantity Demanded } & \text { Marginal Utility } & \text { Total Utility } \\\hline \$ 15 & 1 & & \\\hline \$ 12 & 2 & & \\\hline \$ 9 & 3 & & \\\hline \$ 6 & 4 & & \\\hline \$ 2 & 5 & & \\\hline\end{array}$$