Perform the following:

a$.$ Represent the unsigned decimal numbers $791$ and $679$ in BCD$,$ and then show the

steps necessary to form their sum.

b$.$ If the numbers $(+7528{)}_{10}$ and $(+641{)}_{10}$ are in signed magnitude format.

Compute, $(+641{)}_{10}+(-7528{)}_{10}$ using both $1\text{'}$s and $2\text{'}$s complement method