UF issued a 20-year bond that pays a semi-annual coupon of $32.00, has a par value of $1,000, and a nominal annual yield-to-maturity of 7.639 percent. This bond can be called in 5 years, and the nominal annual yield-to-call is 10.15 percent. Determine the call premium for this bond. $30 $40 $60 $70 $50