Standard costing – variances

Runswick Fisheries catch and process crabs. There are 4 employees processing and dressing the crabs. Time allowed to dress and prepare a crab is 3 standard minutes. Each employee works a standard 35 hour week, although overtime is often worked. The standard labour rate per hour is $6.20.

Standard material cost per crab is $1.30 but not all crabs processed meet quality standards as wastage occurs.

The budgeted fixed cost for the month is $3750. For the month August 20×1 its budgeted output was 12000 dressed crabs or 3000 units per week.

During the week ending 18/8/20X1:
– 3050 crabs were dressed satisfactorily, but 3110 were used
– actual cost of crabs was $4354
– actual hours worked were 162
– actual cost of labour $1021
– fixed overheads incurred were $990

Calculate variances for the week ending 18/8/20×1 (4 weeks in a month)

I have several questions:
a) for budgeted hours: is it 3000 (budgeted output) x 3min/60min = 150 h
b) what do we take for standard and actual quantity when calculating direct material variance? do we take 3050 as the actual quantity and 3110 as standard or vice versa?
c) which quantity do we use to calculate standard hours? 3050?
d) for budgeted expenditure: the question says that the budgeted fixed cost for the month is $3750. Since we have to calculate the figures only for one week, do we divide 3750/4 or du we use the full amount to calculate OAR?

Thank you in advance for your help