Leon Company's city center plant recently hired a second shift of employees who manufacture the product Plumbo. (The second shift works from A p.m. to midnight after the first shift is finished, which doubles the total plant capacity.) Information about the cost of labour in the previous month is as follows: d) The labour efficiency variance at the city center plant in the previous month was: a. $10,300 unfavourable b. $13,000 favourable c. $10,300 favourable d. $13,000 unfavourable