He still owes them the money for the fuel ;-)
He owes 480 and he's spent 30.
Currency devalued on the way home?
He still owes 450 for the car + the 30 he spent = 480, which is what you said; no problem.To add the 30 to the 480 he owes is wrong; if he still had it he could reduce the debt to 450, which is the cost of the car.
He stole the other 10 from the gas station attendant?
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