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Find the duration of a 8% coupon bond making semi-annual coupon payments if it has four years until maturity and a yield to maturity of 6%. (Do not round intermediate calculations. Round your answers to 2 decimal places.) Find the duration of a 10% coupon bond making quarterly coupon payments if it has four years until maturity and a yield to maturity of 12%. (Do not round intermediate calculations. Round your answers to 2 decimal places.)