\[\boxed{\mathbf{3.428}}\]
\[62t + 38t - 67 =\]
\[= (62t + 38t) - 67 = 100t - 67\]
\[t = 67:\]
\[100 \cdot 67 - 67 = 6700 - 67 =\]
\[= 6633.\]
\[t = 670:\]
\[100 \cdot 670 - 67 = 67\ 000 - 67 =\]
\[= 66\ 933.\]
\[t = 6700:\]
\[100 \cdot 6700 - 67 =\]
\[= 670\ 000 - 67 = 669\ 933.\]