The standard cost of labour input for Product B is: 2 hours of skilled labour paid at 15 per hour Last month 1,000 units of Product B were produced, and the skilled labour cost was 25,300 for 2,700 hours of work. Calculate the total labour variance: O a. 10,300 Adverse b. 4,700 Favourable c. None of the answers given are correct d. 4,000 Favourable