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A young couple wants to have a college fund that will pay $40,000 at the end of each half-year for 8 years.

If they can invest at 6%, compounded semiannually, how much do they need to invest at the end of each 6-month period for the next 18 years in order to begin making their college withdrawals 6 months after their last investment? (Round your answer to the nearest cent.)