ABC company pays a sales commission of 5% on each unit sold. If a graph is prepared with the vertical axis representing per-unit cost and the horizontal axis represented units sold how would a line that depicts sales commission be drawn?
a. As a straight diagonal line, sloping upward to the right.
b. as a straight diagonal line sloping downward to the right.
c. as a horizontal line.
d. as a vertical line.
e. as a curvilinear line.