The Hi-Tech Company has a normal monthly capacity of 10,000 labor hours with a standard production of 8,000 units at this capacity. Standard costs are: Materials 2kg @ $0.50, Labor $9 per hour. FOH at normal capacity: Fixed expense $5000, Variable expense $1.50 per labor hour. During May, actual FOH totaled $ 17,550 and 9000 labor hours cost $ 76,500. During the month, 7000 units were produced using 14,400 kg of materials at a cost of $0.51 per kg. Required: Calculate Materials price variance, materials quantity variance, Labor rate variance, labor efficiency variance and FOH variances (i.e. spending variance, idle capacity variance and efficiency variance).