Based on the Graph, Find the Range of Y = $\$ 1200$

Multiple Choice

Based on the graph, find the range of y = f(x) .
-A salesperson gets a commission of $\$ 1200$ for the first $\$ 10,000$ of sales, and then $\$ 600$ for each additional $\$ 10,000$ or partial of sales. Let $S ( x )$ represent the commission on $x$ dollars of sales. Find the value of $S ( 45,000 )$ .

A) $\$ 3600$
B) $\$ 3300$
C) 3900
D) $\$ 2700$