Answer
Fill the blank with
... amount $A_{f}$ ...
Work Step by Step
See p. 869.
The amount $A_{f}$ of an annuity consisting of $n$ regular equal payments of size $R$ with interest rate $i$ per time period is given by
$A_{f}=R\displaystyle \frac{(1+i)^{n}-1}{i}$
Fill the blank with
... amount $A_{f}$ ...
