A company manufactures custom-designed keychains. There is a one-time design fee of $75.00 for each order. The cost to produce each keychain is $3.50. However, if an order is for 100 keychains or more, the production cost per keychain is reduced to $3.00 for all keychains in that order. What is the greatest number of keychains that can be ordered if the total budget is $600?
