Four years ago, Tango Company sold a $20-$year bond issue with a $12\%$ coupon rate $($paid annually$)$ and a $10\%$ call premium. Today, Tango calls the bonds. The bonds originally were sold at their face value of $$1,000.$ Compute the realized return per year $($also called the holding period yield or return$)$ for investors who purchased the bonds when they were issued and who surrender them today in exchange for the call price.