Bairstow Consulting Ltd offers a range of IT consulting services. The company's service costing system estimates the cost of each consulting job by accumulating costs of the professional labour that works or the job plus a charge for overhead. The cost of professional labour is charged to jobs using the following three rates:

IT trainee............................................$30 per hour

IT graduate..........................................$75 per hour

IT senior consultant..............................$225 per hour

The predetermined overhead rate is based on professional labour costs, which are budgeted to be $663,600 for the current year. The estimated overhead costs for the current year are budgeted to be:

Management salaries...................................................$735,000

Salaries of clerical and reception staff.................................285,000

Depreciation on IT hardware and software...........................240,000

Stationery...................................................................22,500

Telecommunications.......................................................31,500

Insurance..................................................................180,000

Depreciation on office fixtures and fittings...........................11,250

Rent.........................................................................90,750

Electricity..................................................................39,525

Council rates...............................................................23,475

During the month of June the company provided three services, which consumed the following quantities of professional labour (in hours):

Required:
1. Calculate the predetermined overhead rate to be used at Bairstow Consulting.
2. Calculate the cost of the three services.
3. How might the management of Bairstow Consulting use this information?
4. How would Bairstow's approach differ if the firm used a billing rather than a costing system?

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IT Graduate IT Trainee Senior consultant Client 15 Robinsons 50 100 140 Smith and Son Snowman Services 10 20 70 80