Cully furniture buys 2 products for resale: big shelves (b) and medium shelves (m). each big shelf costs $500 and requires 100 cubic feet of storage space, and each medium shelf costs $350 and required 90 cubic feet of storage space. the company has $75,000 to invest in shelves this week, and the warehouse has 18,000 cubic feet available for storage. profit for each big shelf is $300 and for each medium shelf is $150. what is the budget constraint? 300b + 150m > = 75,000500b + 350m < = 75,000300b + 150m > = 75,000500b + 350m > = 75,000