The Green Cable Corporation issued a new series of bonds on January 5, 2015. The bonds were sold at par ($1,000), have a 6% coupon rate, and mature in 30 years on December 31, 2044. Coupon interest payments are made semiannually (on June 30 and December 31). On July 1, 2017, the bonds sold for $922.38. What was the current yield at sale on that date