\(0.01\,\text{M}\) KMnO\(_4\) solution was added to \(20.0\,\text{mL}\) of \(0.05\,\text{M}\) Mohr's salt solution through a burette. The initial reading of \(50\,\text{mL}\) burette is zero. The volume of KMnO\(_4\) solution left in the burette after the end point is ______ \( \text{mL} \). (nearest integer)
