4. ABC Manufacturing Co. sets standard costs for its products. For product X, the standard direct materials cost is $10 per unit, and the standard direct labor cost is $8 per unit. During the month, the company produced 5,000 units of product X and incurred actual direct materials costs of $52,000 and actual direct labor costs of $40,000. Calculate the direct materials price variance, direct materials quantity variance, direct labor rate variance, and direct labor efficiency variance.