Suppose a Jar of DeLux Popcorn That Is Ultimately Sold

Multiple Choice

Suppose a jar of DeLux popcorn that is ultimately sold to a customer at Friendly Groceries is produced by the following production process:  
$$\begin{array} { | l | c | c | } \hline { \text { Name of Campany } } & \text { Revenues } & \text { Cast af Pur chased Inguts } \\\hline \text { Fulton Farrily Farm } & \$ 0.50 & \mathbf { 0 } \\\hline \text { DeLux Popconl Co. } & \$ 2.50 & \$ 0.50 \\\hline \text { Friendly Groceries } & \$ 4.00 & \$ 2.50\end{array}$$  
What is the sum of the value added of all of the firms?

A) $3.00
B) $4.00
C) $6.50
D) $7.00