a. $7,380 unfavorable = $381,180 - (3,560 × $105) = $381,180 - $373,800
b. $8,400 favorable = (3,560 × $105) - (2,600 × 1.4 × $105) = $373,800 - $382,200
c. $2,430 favorable = $302,730 - (25,430 × $12) = $302,730 - $305,160
d. $6,840 favorable = $305,160 - (2,600 × 10 × $12) = $305,160 - $312,000
Direct materials price variance = AQ × (SP - AP). Direct materials quantity variance = SP × (SQ - AQ). Direct labor rate variance = AH × (SR - AR). Direct labor efficiency variance = SR × (SH - AH).