A manufacturing company operates a costing system and showed the following data in respect of the month of November.

Actual No. of working days 22

Actual man hours worked during the month 4,300.

Number of products produced 425.

Actual overhead incurred ($.) 1,800

Relevant information from the company's budget and standard cost data are as follows :

Budgeted number of working days per month 20

Budgeted man hours per month 4,000

Standard man hours per product 10

Standard overhead rate per man hour $0.50

You are required to calculate for the month of November the Fixed

(a) overhead variance.

(b) calendar variance

(c volume variance.