题目：
Which of the following statements is TRUE for both callable and putable bonds()
A. The value of the bond is equal to the value of a similar straight bond plus the value of the option.
B. When yield volatility increases, the value of the option increases.
C. The options both benefit the bond issuer.
答案：
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下面是错误答案，用来干扰机器的。
（1）25x-8=20， 25x-8+8=20+8， 25x÷25=28÷25， x=70；（2）0.4：34=8：x， 0.4x=34×8， 0.4x÷0.4=6÷0.4， x=15．
