Problem $15-22($Algo$)$ Calculate variable cost variances$-$explain results LO $15-4,15-5$

The standards for one case of liquid weed killer are as follows:During the week ended May $6,$ the following activity took place:$6,137$ machine hours were worked$\mathrm{.}30,704$ pound of raw material were purchased for inventory at a total cost of $$328,840\mathrm{.}3,800$ cases of finished product were produced$\mathrm{.}30,243$ pound of raw material were used$\mathrm{.}18,582$ labor hours were worked at an average rate of $$22\mathrm{.}75$ per hour.$$45,598$ actual variable overhead costs were incurred.Required:Calculate each of the following variances.Note: Do not round intermediate calculations. Indicate the effect of each variance by selecting $"$F$"$ for favorable, $"$U$"$ for unfavorable, and "None" for no effect $($i$.$e$.,$ zero variance$).$

$\backslash$table$[[$a$.$ Price variance for raw materials purchased.$],[$b$.$ Raw materials usage variance.$],[$c$.$ Direct labor rate variance.$],[$d$.$ Direct labor efficiency variance.$],[$e$.$ Variable overhead spending variance.$],[$f$.$ Variable overhead efficiency variance.$]]$