E$9-8($Algo$)$ Calculating Direct Materials Variances $[$LO $9-3]$

Parker Plastic, Incorporated, manufactures plastic mats to use with rolling office chairs. Its standard cost information for last year follows:

$\backslash$table$[[,$Standard Quantity,Stan:,ard Price $($Rate$),\backslash$table$[[$Standard Unit$],[$cost$]]],[$Direct materials $($plastic$),13$ square foot,$$1\mathrm{.}55,$per square foot,$$20\mathrm{.}15$