The standard labour details for 5 units of a product is given below: Labour Hours Rate per hour (OMR) Skilled 150 10 Unskilled 100 6 For a given period, actual labour details for 5 units of the products is given as: Labour Hours Rate per hour (OMR) Skilled 130 12 Unskilled 80 5 You are required to calculate labour mix variance (OMR). a. Skilled 40 A, Unskilled 24 F b. Skilled 40 F, Unskilled 24 A c. Skilled 485 A, Unskilled 234 F d. Skilled 485 F, Unskilled 234 A