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An electric furnace is to melt 40 kg of aluminium per hour, the initial temperature of the aluminium being 12 °C. Calculate: (a) the power required, and (b) the cost of operating the furnace for 20 h, given that aluminium has the following thermal properties: specific heat capacity, 950 J/kg K; melting point, 660 °C; specific latent heat of fusion, 450 kJ/kg. Assume the efficiency of the furnace to be 85 per cent and the cost of electrical energy to be 8.0 p/kW h.