cole laboratories makes and sells a lawn fertilizer called fastgro. the company has developed standard costs for one bag offastgro as follows: standard standard cost quantity per bag direct material 20 pounds $8.00 direc labor 0.1 hours $1.10variable overhead 0.1 hours $0.40 the company had no beginning inventories of any kind on jan. 1. variable overhead isapplied to production on the basis of standard direct labor-hours. during january, the following activity was recorded by thecompany: bull production of fastgro: 4,000 bags bull direct materials used: 85,000 pounds at a cost of $32,300 bull directlabor worked: 390 hours at a cost of $4,875 bull variable overhead incurred: $1,475 the total variance both rate andefficieny for varialbe overhead for january 1: a. $85 f b. $40 F c. 100 u d. 125 f