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Direct Materials, Direct Labor, and Factory Overhead Cost Variance Analysis Santiago Inc, processes a base chemical into plastic, standard costs and actual costs for direct materlals, direct labor, and foctory overhead incurred for the manufacture of 78,000 units of product were as follows: Required: a. Determine the direct materials price variance, direct materials quantity variance, and total direct materials cost variance, Enter a favorable variance as a negative number using a minus sign and an unfavorable variance as a postive number. b. Determine the direct labor rate variance, direct labor time variance, and total direct labor cost variance. Enter a favorable variance as a negative number using a minus sign and an unfavorable variance as a positive number. b. Determine the direct labor rate variance, direct labor time voriance, and total direct labor cost varlance, Enter a favorable variance as a negative number using a minus sign and an unfavorable variance as a positive number. c. Determine the vanable factory overhead controllabie vaflance, flxed factory overhead volume variance, and total factory overhead cost variance. Enter a favorable variance as a negative number using a minus sign and an unfavorable variance as a positive number