$3$ please do all $4$

$1.$Compute the standard overhead rate. Hint: Standard allocation base at $80\%$ capacity is $30,000$ DLH$,$ computed as $8,000$ units $\backslash$times $3\mathrm{.}75$ DLH per unit.

$2.$Compute the total overhead variance.

$3.$Compute the overhead controllable variance.

$4.$Compute the overhead volume variance.