求证明期货、期权及其他衍生品那本书上的一个公式
题目如下:
Prove the following formula (Hint: equate the final amount available when (a)investing $1 at R2 for T2 years and (b) investing $1 at R1 for T1 years, followed by (T2-T1) years at Rf:
Rf=(R2T2-R1T1)/(T2-T1)
求大神指教~~~~


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