4. Below is the information of Lyn Company for the month of January: Actual labor hour used 3,150 hours Standard materials price P2.50 per unit Actual labor rate per hour P3.00 Standard quantity of materials used 4,050 units Standard labor hours used 3,000 hours Actual materials price P2.52 per unit Standard labor rate per hour P3.10 Actual quantity of materials purchased and used 4,450 units Required: Compute the following a. Materials price variance b. Materials efficiency variance c. Labor rate variance d. Labor efficiency variance