Sam Owns a Candy Factory and Hires Workers in a Competitive

Sam owns a candy factory and hires workers in a competitive labor market to pack cases of candy.The company's weekly output of cases of candy varies with the number of workers hired,as shown in the table: $$\begin{array} { c c } \text { Number of workers } & \text { Cases/week } \\0 & 0 \\1 & 160 \\2 & 310 \\3 & 450 \\4 & 580 \\5 & 700 \\6 & 810\end{array}$$
If each case sells for $3 more than the cost of the materials used in producing it,then the most Sam would pay the 5^th worker is _______.

A) $330
B) $360
C) $390
D) $120