Production and overhead cost information is provided below fro Kian manufacturing ltd:

1. Total budgeted overhead= $1,145,000 , applied using direct labour hours.

2. Predetermined fixed overhead rate= $1.16 per unit of product produced.

3. Budgeted production for the period= $125,000 units, each using 4 direct labour hours.

4. Actual production for the period= 122,500 units, using 492,500 direct labour hours.

5. Actual variable overhead costs incurred were $1,000,000.

Actual fixed overhead costs incurred were $152,450.

a) What is the fixed overhead volume variance for the period?

b) What is the variable overhead rate variance for the period?