The following direct materials and direct labor data pertain to the operations of Riverbed Company for the month of August. Costs Actual labor rate Actual materials price Standard labor rate Standard materials price $17.50 per hour $132.00 per ton $14.50 per hour $134.00 per ton Quantities Actual hours incurred and used 4,520 hours Actual quantity of materials purchased and used 1,276 tons Standard hours used 4,790 hours Standard quantity of materials used 1,240 tons (a) Compute the total, price, and quantity variances for materials and labor. Total materials variance $ Materials price variance $ Materials quantity variance. $ Total labor variance $ Labor price variance $ $ Labor quantity variance