$8$ bit Arithmetic using $2\text{'}$s Complement

Assume that a computer performs $8-$bit arithmetic on signed binary values in $2\text{'}$s Complement form and that the fractional part of real values is allocated three of the $8$ bits. $($If there is no fractional part involved in the calculation, all $8$ bits are used for the number itself.$)$ Perform the specified operations in binary to find the result produced by the computer. $($If overflow happens, please indicate it next to your result.$)->$ This scenario is for the next three arithmetic calculation problems.

Assuming that a computer performs $8-$bit arithmetic on signed binary values in $2\text{'}$s complement form and two of the eight bits are used to represent the fractional portion of real values. Solve $19\mathrm{.}2510-28\mathrm{.}7510$ in binary to find the result produced by the computer.