[tex]C_p=\frac{m_s}{m_r}\cdot100\%\\\\m_s\rightarrow masa \ substancji\\\\m_r\rightarrow masa \ roztworu \ (substancji+rozpuszczalnika)\\\\m_s=60 \ g\\\\m_r=60 \ g+240 \ g=300 \ g\\\\C_p=\frac{60g}{300g}\cdot100\%=\frac{1}{5}\cdot100\%=\huge\boxed{20\%}[/tex]
