At one point, certain U.S. Treasury bonds were callable. Consider the prices in the following three Treasury issues as of May 15, 2017: 05/15/2020 6.40 108.65625 108.71875 .31250 3.320 05/15/2020 7.45 109.18750 109.25000 .09375 4.140 05/15/2020 8.15 114.25000 114.43750 .46875 3.080 The bond in the middle is callable in February 2018. What is the implied value of the call feature? Assume a par value of $1,000. (Hint: Is there a way to combine the two noncallable issues to create an issue that has the same coupon as the callable bond?) (Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.)