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Karyn purchased a computer for $12,000 on January 1, 20X1. Because her new web-based business requires the latest tech, she plans to replace her computer every five years. The old one will still have a market value of $2,000 but she will donate it to charity. She plans to bill $500 per month to clients. Using the discounted payback method, the amount of time to recapture the original cost will be .