Answer
A)$\$1000$.
B)$\$1100$.
C) $\$15$
Work Step by Step
A) The graph shows that at a price of $\$ 10$, the revenue would be $\$ 1000$.
B) The graph shows that the maximum revenue per month is $\$1100$.
C) From the graph, we see that the price that gives maximum revenue is $\$ 15$.
D) The reason is that the cost of a T-shirt becomes higher after the vertex. This will lead to the drop of sales in T-shirt as people are less likely to buy at higher cost.
