A firm's bonds have a maturity of 10 years and a $1,000 face value. These bonds pay a semi-annual coupon rate of 4% and currently sell for $938.71. The bonds are callable in 4 years at a call price of $1,040.00. What is the yield to call (YTC) on these bonds? 3.33% 4.44% 6.08% 6.66% 7.50%