$R$ is deposited at the end of each period for $n$ periods at rate $i$ a period. Which formula gives the amount in the fund just after the last deposit?

Explanation

1. 01

   Each deposit grows for the periods left after it: the first for $n - 1$, the last for none.

2. 02

   Adding the geometric series gives $R\,\frac{(1 + i)^{n} - 1}{i}$.