Baker Company Adopted a Standard Cost System Several Years Ago $10 \mathrm{~kg} @ \$ 4.50$

Baker Company adopted a standard cost system several years ago.The standard costs for the prime costs of its single product follow: Material: $10 \mathrm{~kg} @ \$ 4.50$ per kilogram $\quad$$\$ 45.00$
Labour: 6 hours $@ \$ 8.50$ per hour $\quad$$\quad$$\quad$$\$ 51.00$ The following operating data were taken from the records for December:
1.
Units completed:
5,800 units
2.
Budgeted output:
6,000 units
3.
Materials purchased:
60,000 kg
4.
Total actual labour costs:
$306,600
5.
Actual hours of labour:
36,500 hours
6.
Material usage variance:
$2,250 unfavourable
7.
Total material variance:
$450 unfavourable
Compute the following: A. Labour rate variance
B. Labour efficiency variance
C. Actual kilograms of material used in the production process
D. Actual cost paid per kilogram of material