$($b$)001101111000\mathrm{.}01110101*$Represent the decimal numbers $715$ and $354$ in BCD$\mathrm{.}3-55.$ The following binary numbers have a sign in the leftmost position and, if

negative, are in $2s$ complement form. Perform the indicated arithmetic

operations and verify the answers.

$($a$)110001+011101$

$($b$)0110111+0101111$

$($c$)00000111-11110100$

$($d$)0110111-0101111$

Indicate whether overflow occurs for each computation.