A moving company is loading $x$ small boxes and $y$ large boxes onto a truck. The truck can hold at most 100 boxes. Each small box weighs 5 pounds, and each large box weighs 8 pounds. The total weight of the boxes must be at least 600 pounds.

A store is selling $x$ small boxes and $y$ large boxes. They have at least 100 boxes in stock. Each small box costs $5, and each large box costs $8. The total revenue from sales must not exceed $600.

A factory is producing $x$ small boxes and $y$ large boxes. They produce a total of at least 100 boxes. Each small box requires 5 minutes to assemble, and each large box requires 8 minutes. The total assembly time must be at most 600 minutes.

A warehouse is storing $x$ small boxes and $y$ large boxes. The total number of boxes stored is exactly 100. Each small box occupies 5 cubic feet, and each large box occupies 8 cubic feet. The total volume occupied must be at least 600 cubic feet.