How to get $$11,250\mathrm{.}00,$ $$10,583\mathrm{.}93,$ and $$666\mathrm{.}07?$

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AMORTIZATION OF PREMIUM

A corporation purchased a $$50,000$ bond at a coupon rate of $7\mathrm{.}5\%$ and redeemable in three years. If the yield rate at the time of purchase was $7\%$ compounded semi$-$annually, construct the bond schedule showing the amortization of the premium.