The following data relate to actual output, costs and variances for the four- weekly accounting period number 4 of a company that makes only one product. Opening and closing work in progress figures were the same.

(£000)

Actual production of product XY

18 000 units

Actual costs incurred:

Direct materials purchased and used (150 000 kg)

210

Direct wages for 32 000 hours

136

Variable production overhead

38

(£000)

Variances:

Direct materials price

15 F

Direct materials usage

9 A

Direct labour rate

8 A

Direct labour efficiency

16 F

Variable production overhead expenditure

6 A

Variable production overhead efficiency

4 F

Variable production overhead varies with labour hours worked.

A standard marginal costing system is operated.

You are required to;

(a) Present a standard product cost sheet for one unit of product XY,

(b) Describe briefly three types of standard than can be used for a standard costing system, stating which is usually preferred in practice and why.