At zero direct labor hours in a flexible budget graph, the total budgeted cost line intersects the vertical axis at $$\$ 30,000$$. At 10,000 direct labor hours, a horizontal line drawn from the total budgeted cost line intersects the
vertical axis at $$\$ 90,000$$. Fixed and variable costs may be expressed as:
a. $$\$ 30,000$$ fixed plus $$\$ 6$$ per direct labor hour variable.
b. $$\$ 30,000$$ fixed plus $$\$ 9$$ per direct labor hour variable.
c. $$\$ 60,000$$ fixed plus $$\$ 3$$ per direct labor hour variable.
d. $$\$ 60,000$$ fixed plus $$\$ 6$$ per direct labor hour variable.