4.23 Historical costs for one project have provided the following data: Direct material: $7,500, 000 Direct labor: 100 employees at $25 per hour for 525 hours each 500 employees at $20 per hour for 875 hours each 200 employees at $15 per hour for 1050 hours each Subcontract costs: $2,500,000 Equipment: $600,000 General expenses include office rent, $250,000; insurance, $160,000; furniture and supplies, $150,000; telephone and computers, $50,000; and salaries, $500,000. Project expenses include per- mits, $25,000; superintendence, $100,000, storage and protection, $75,000; and other project ex- penses, $400,000 Find the office and job overhead rate. (Hint: Consider equipment as project overhead expense.)