Show how the following floating$-$point additions are performed $($where significands

are truncated to $4$ decimal digits$).$ Show the results in normalized form.

a$.5\mathrm{.}566*10^2+7\mathrm{.}777*10^2$

b$.3\mathrm{.}344*10^1+8\mathrm{.}877*10^-2$