有關計算復利息的算式.

r% 係年利率, 月利率 = r%/12, 三個月利率 = r%/4
nt 中的n代表每年所分的期數.
例如:每月複利計 => n = 12 (一年內)
如十年, n = 12x10 = 120, 如此類推
所以 p(1+r/(100x12)) = 第一個月的本利和,
第二個月的本利和 = p(1+r/(100x12)) (1+ r/(100x12))
第三個月的本利和 = p(1+r/(100x12))^2 (1+r/(100x12))
... 如此類推,
如10年, nt = 120期, p(1+r/(100x12))^120
又例如:每三個月複利計 => n = 4(一年內)
如十年, n = 4 x 10 = 40, 如此類推
第一個三個月期的本利和 = p(1+r/100n)
第二個三個月期的本利和 = p(1+r/(100x40)) (1+ r/(100x40))
第三個三個月期的本利和 = p(1+r/(100x40))^2 (1+ r/(100x40))
如十年, nt = 4x10 = 40
第40個三個月期的本利和 = p(1+r/(100x40))^39 (1+ r/(100x40))

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