Please use step down method to allication support department, and show each step allocation. thx

Support departments Operating departments Plant Admin Engineering Control Machining Assembly Budgeted overhead costs before any 300,000 264,000 150,000 450,000 250,000 interdepartmental allocation Plant Admin 5% 15% 35% 45% Engineering 15% 15% 25% 50% Control 15% 10% 40% 35%