The standard labour, and the actual labour employment in a week for a job are as under: During the 40-hours working week, the gang produced 1,800 standard labour-hours of work. Calculate the: (1)...

The standard labour, and the actual labour employment in a week for a job are as under:

During the 40-hours working week, the gang produced 1,800 standard labour-hours of work. Calculate the: (1) Labour efficiency variance; (2) Labour mix variance; (3) Rate of wages variance; and (4) Total labour cost variance.