4. FBC (Pty) manufactures one product, Product X. You were given the following information for period 4. Product X has a standard material cost as follows: 10 kilograms of material Y at P10 per kg = P100 per unit of X. During period 4; 1, 000 units of X were manufactured, using 11, 700 kg of material Y which cost P98, 631. The standard labour cost of product X is as follows: 2 hours of grade Z labour at P10 per hour = P20 per unit of product X. During period 4; 1, 000 units of product X were made, and the labour cost of grade Z labour was P17, 825 for 2, 300 hours of work. a. Calculate the following variances: Material price variance b. Material usage variance The labour rate variance d. The labour efficiency variance c. (4 marks) (4 marks) (4 marks) (4 marks)