The manager of a garden center wants to place an order for Hawthorn trees and Service Berry trees so that the number of service trees is 6 times the number of Hawthorn trees. Each Hawthorn tree costs $250 and each Service Berry tree costs $125. If the budget requires that the total cost of the trees be less than $30,000 and that there be at least 20 Hawthorn trees, what are the different possibilities for the number of Hawthorn trees in the order?

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