The Bank of Zambia using the Open Market Operations issues out government bond

that matures in $10$ years. The bond$$s face value is K$1000$ and pays an annual $7\mathrm{.}5$ per

cent coupon interest rate. The current price of the bond is K$1,125.$The bond begins to

be callable in $5$ years at a call price of K$1050.$ Calculate the yield to call