Gengis
You probably wanted the price in pence per litre (up to low 30s now) or $dollars per tonne (about $670 right now) or maybe even $dollars per gallon (nearly $1.95 ish....)
What you didn't expect was a price for whatever unit you cared to guess at - was the answer litres or maybe lbs?
:-)
couldn't be bothered to do the maths and work out what the unit is we are meant to guess at - but I know it isn't per Kg