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An aeroplane weighing 63,000 kg flies up...

An aeroplane weighing 63,000 kg flies up from sea level to a height of 8000 metre. Its engine run with pure normal octane `(C_(8)H_(18)`) has a 30% of efficiency. Calculate the fuel cost of the flight, if octane sells at Rs 3/- per litre. Given density of octane = 0.705 g `mL^(-1)`, heat of combustion of octane = 1300 kcal `"mol"^(-1)` (g = 981 cm/`"sec"^(2)` )

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