The standard cost of labour input for Product B is: 2 hours of skilled labour paid at 10 per hour Last month 900 units of Product B were produced, and the skilled labour cost was 17,000 for 2,500 hours of work. Calculate the total labour variance: O a. 1,000 Favourable Ob. 18.000 Adverse Oc. None of the answers given are correct d. 700 Favourable