Answer
The value of A is \[\frac{C}{1+r}\].
Work Step by Step
Consider the equation,
$C=A+Ar$
Take out $A$ from the right side of the equation.
$C=A\left( 1+r \right)$
Divide both sides by $\left( 1+r \right)$.
$\begin{align}
& \frac{C}{1+r}=\frac{A\left( 1+r \right)}{1+r} \\
& \frac{C}{1+r}=A
\end{align}$
Therefore, the value of $A$ is $\frac{C}{1+r}$.
