Please answer a, b, c & d of this management accounting question

5. FarmFresh produces luxury Easter picnic baskets (6 per box) which has the following standard cost per box: / Unit 48 35 Direct Material (on average) 4 kg @ 12 per kg Direct Wages 5 hrs @ 7 per hour Variable prodn. ohd 5 hrs @ 2 per hour Fixed prodnohd 5 hrs @ 10 per hour 10 50 143 Variable production overhead is deemed to vary with the hours worked. During the period the Actual results were as follows: Production 18.000 Units Direct Material Direct Wages Variable prodn overhead Fixed production overhead 76,000 kg costing 84,000 hrs worked 84.000 hrs worked 836.000 604,800 172,000 1,030,000 2,642,800 Required: a) Using the Information above calculate the sub variances for Materials, Wages and Variable overheads. (6 marks) Fixed overheads are absorbed into production on the basis of standard hours of production and the normal volume of production for the period is 20,000 units (100,000 hours of production) b) Using the information above on the budgeted fixed overheads calculate the fixed overhead expenditure and volume variances. (1 mark) c) Put all 8 calculated sub- variances into a schedule which reconciles Actual (2,642,800) to Standard cost (2,574,000). (1 mark) d) Comment briefly on the usefulness to management of investigating variances. (2 marks)