A bond trader bought this bond at YTM of 12% and sold it 6 months later when the YTM is 8%, what is annual effective return for this trade?

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A two-year bond with a 10% percent coupon pays interest of 10% and face value is 1000. We assume interest is paid semi-annually. A bond trader bought this bond at YTM of 12% and sold it 6 months later when the YTM is 8%, what is annual effective return for this trade