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Your coworker is planning to retire in 20 years. To help save money for his retirement, he will make quarterly deposits into an account that earns 6% interest compounded quarterly. How much will he have to deposit at the end of each quarter until he retires, so that he can withdraw $40,000 semiannually over the first 10 years of his retirement? Assume that his first withdrawal occurs at the end of six months after his retirement.