A company is planning to buy new carts to store merchandise. The owner believes they need at least 2 standard carts and at least 4 deluxe carts. The company can afford to purchase a maximum of 15 carts at this time; however, the supplier has only 8 standard carts and 11 deluxe carts in stock. Standard carts can hold up to 100 pounds of merchandise, and deluxe carts can hold up to 250 pounds of merchandise. How many standard carts and deluxe carts should be purchased to maximize the amount of merchandise that can be stored?