Solve the Problem $\$ 15$ Per Copy, the Cost of Book 2 Is

Multiple Choice

Solve the problem.
-Three different high schools plan to order the same three text books. School A plans to order 20 of book 1, 100 of book 2, 80 of book 3. School B plans to order 40 of book 1, 40 of book 2, 80 of book 3. School C plans to order 70 of book 1, 40 of book 2, 10 of book 3. The cost of book 1 is $\$ 15$ per copy, the cost of book 2 is $\$ 20$ per copy, and the cost of book 3 is $\$ 25$ per copy. What matrix product displays the cost to each school of buying the textbooks? Display the two matrices which must be multiplied and their product.

A)
B) $\left[\begin{array}{lll}15 & 20 & 25\end{array}\right]\left[\begin{array}{l}200 \\ 160 \\ 120\end{array}\right]=\left[\begin{array}{lll}300032003000\end{array}\right]$
C) $\left[\begin{array}{lll}15 & 20 & 25\end{array}\right]\left[\begin{array}{lll}20 & 100 & 80 \\ 40 & 40 & 80 \\ 70 & 40 & 10\end{array}\right]=\left[\begin{array}{lll}2850 & 3300 & 3050\end{array}\right]$
D) $\left[\begin{array}{lll}15 & 20 & 25\end{array}\right]\left[\begin{array}{l}130 \\ 180 \\ 170\end{array}\right]=\left[\begin{array}{ll}195036004250\end{array}\right]$