please show why each answer is correct

Boring Company is a producer of classical music records. The information below pertains to the July production of its most popular record, "Beddy-Bye with Beethoven." Boring's overhead rates are based on direct labor hours 120 records were produced in July and 90 were sold What is Boring's materials price variance for July? $145 unfavorable $130 unfavorable $15 unfavorable $0 None of the above What is Boring's variable overhead rate variance for July? $86 favorable $86 unfavorable $24 unfavorable $24 favorable What is Boring's labor efficiency variance for July? $72 unfavorable $72 favorable $18 unfavorable $18 favorable What is Boring's materials quantity (usage) variance for July? $130 favorable $130 unfavorable $15 favorable $15 unfavorable zero