A refinery has a single compact unit for refining crude oil. The cost of processing 100 litres of crude oil is $75. The standard yield per 100 litres of crude oil and the selling price of each product are indicated below: Product mix Selling price per litre $ Standard yield (in litres per 100 litres of crude) 25 20 20 Motor spirit (petrol) Diesel oil Fuel oil Kerosene Gas (M3 converted into litres) Loss 3.00 1.50 1.10 0.80 0.60 25 5 5 You are required to compute the unit cost of each product by selecting an appropriate base for cost allocation