SAT备考 - 每日一题（61）初始投资、利息、投资年限和未来价值

[61] 这道题很有实用性。关于初始投资、利息、投资年限和未来价值 A = P(1+r)^t If an initial investment, P, bears interest at a rate, r, and is compounded annually, its future value, A, after t years can be determined with the equation above. Which of the following equations shows the interest rate in terms of the future value, initial investment, and number of years invested? 如果初始投资P以利率r计息，并且按年复利，那么t年后，这笔投资的未来价值A，可以用上述方程确定。问题：以下哪个方程式可以表达出利率与未来价值、初始投资和投资年限之间的关系？