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During the past 6 months, 15 of an Australian-based company's customers have left to do
business with one of its competitors. During the same time, the company has started
doing business with 25 new customers. The average revenue that outgoing customers
generated was $1000. The average revenue that new customers generated was $500.

How many more customers generating the average revenue for new customers does the company need to account for the difference between the revenue for outgoing and new customers?