A company's lawn seed mixtures contain three types of seeds: bluegrass, rye, and Bermuda. The costs per pound of the three types are 13 cents, 18 cents, and 7 cents, respectively. In each batch there must be at least 20% bluegrass seed and the amount of rye must be at least two-thirds the amount of Bermuda. To fill current orders the company must make at least 9000 pounds of the mixture. How much of each kind of seed should be used to minimize cost? The minimum cost of $ occurs with a mixture of pounds of bluegrass seed, pounds of rye seed, and pounds of Bermuda seed. (Simplify your answers. Do not include the $ symbol in your answers.)