问题如下图：
选项：
A. 
B. 
C. 
D. 
解释：
麻烦请问：这题可否用exp(8%*T)=2求解T？
NO.PZ2016082402000003 问题如下 Consir a savings account thpays annuinterest rate of 8%. Calculate the amount of time it woultake to uble your money. Rounto the nearest year. 7 years 8 years 9 years 10 years ANSWER: CThe time T relates the current anfuture values suthFVPV=2=(1+8%)t\frac{FV}{PV}=2={(1+8\%)}^tPVFV=2=(1+8%)t Taking logs of both sis, this gives T=ln(2)ln(1.08)=9.006T=\frac{ln{(2)}}{ln{(1.08)}}=9.006T=ln(1.08)ln(2)=9.006 Consir a savings account thpays annuinterest rate of 8%. Calculate the amount of time it woultake to uble your money. Rounto the nearest year.为什么存款不是单利，而是复利，且1.08^9.006=1.9999，也不是2啊，为什么不选10years
NO.PZ2016082402000003问题如下 Consir a savings account thpays annuinterest rate of 8%. Calculate the amount of time it woultake to uble your money. Rounto the nearest year. 7 years 8 years 9 years 10 years ANSWER: CThe time T relates the current anfuture values suthFVPV=2=(1+8%)t\frac{FV}{PV}=2={(1+8\%)}^tPVFV=2=(1+8%)t Taking logs of both sis, this gives T=ln(2)ln(1.08)=9.006T=\frac{ln{(2)}}{ln{(1.08)}}=9.006T=ln(1.08)ln(2)=9.006这是什么知识点啊？常规题吗这是
请问，这个如何确定是一次还本付息而不是每年都付息一次呢？
