Xu Feng Sdn Bhd's standard and actual costs per unit for the most recent period, during which 400 units were actually produced, are given below: Standard RM Actual RM 3.00 3.36 9.00 Materials: Standard: 2 feet at RM1.50 per foot Actual: 2.1 feet at RM1.60 per foot Direct labor: Standard: 1.5 hours at RM6.00 per hour Actual: 1.4 hours at RM6.50 per hour Variable overhead: Standard: 1.5 hours at RM3.40 per hour Actual: 1.4 hours at RM3.10 per hour Total unit cost 9.10 5.10 4.34 16.80 17.10 Required: From the foregoing information, compute the following variances. Show whether the variance is favorable (F) or unfavorable (U). Explain ONE (1) possible reason for each variance and suggest ONE (1) corresponding recommendation or solution to further improve on each variance. (a) Materials price variance. (5 marks) (b) Materials quantity variance. (5 marks) (c) Direct labor rate variance. (5 marks) (d) Direct labor efficiency variance