The Playing Card Inc. has identified two methods for producing cards. One method involves using a machine having a fixed cost of $10,000 and variable cost of $1.00 per deck of cards. The other method would be to use a less expensive machine with a fixed cost of $5,000 and variable cost of $1.50 per deck of cards. If the selling price per deck of cards is the same under each method, at what level of output will the two methods produce the same net operating income?