$\"\"$

\

The investment at simple interest is $\"\"$ .

\

Solve for $\"\"$ .

\

Consider $\"\"$ .

\

Common the terms.

\

$\"\"$

\

Divide each side by $\"\"$ .

\

$\"\"$

\

Subtract 1 from each side.

\

$\"\"$

\

Divide each side by $\"\"$ .

\

$\"\"$ .

\

$\"\"$

\

The value of $\"\"$ .