Determine a comprehensive machine hour rate from the following:

Original purchase price (subject to 10% p.a. depreciation on original cost)	Rs. 324,000
Normal working hours for the month	200 hours
(Machine works for only 75% of normal capacity)
Wages to labour (per day for 8 hours)	Rs. 125 per day
Power cost for the month for time worked	Rs. 15,000
Electricity / lighting for the month	Rs. 7,500
Insurance of plant and building (apportioned) for the year	Rs. 16,250
Other general expenses per annum	Rs. 27,500

Explain 2 uses of determining the machine hour rate.