Given the information provided, calculate the following variances. For each one, indicate the effect of each variance by writing beside it $"$F$"$ for favourable, $"$U$"$ for unfavourable, and "None" for no effect $($i$.$e$.,$ zero variance$).$

$1.$ The materials price and quantity variances.

$2.$ The labour rate and efficiency variances.

$3.$ The variable manufacturing overhead spending and efficiency variances.

$4.$ The fixed manufacturing overhead budget and volume variances.