Use the Following to Answer Question 160 -Kaile Cakes Produces 10 Cakes Per Day

Multiple Choice

Use the following to answer question 160: $$\begin{array}{l}\text { Table: Output and Marginal Cost }\\\begin{array} { l c } \hline \text { Output } & \text { Marginal Cost } \\\hline 1 & 15 \\2 & 10 \\3 & 5 \\4 & 8 \\5 & 12 \\6 & 20 \\\hline\end{array}\end{array}$$
-Kaile Cakes produces 10 cakes per day.The marginal cost of the tenth cake is $24,and the average total cost of 10 cakes is $6.The average total cost of nine cakes is:

A) $4.
B) $5.
C) $6.
D) $8.