\[\boxed{\mathbf{296}.\ }\]
\[P = 50 + 6t.\]
\[1)\ t = 10:\]
\[P = 50 + 6 \cdot 10 = 50 + 60 =\]
\[= 110\ (р.).\]
\[2)\ t = 25:\]
\[P = 50 + 6 \cdot 25 = 50 + 150 =\]
\[= 200\ (р.).\]