The Two Aeroplanes
Unreviewed import — a classic from the public domain; its solution has not been machine-checked yet.
math
A man recently bought two aeroplanes, but afterwards found that they would not answer the purpose for which he wanted them. So he sold them for £600 each, making a loss of 20 per cent. on one machine and a profit of 20 per cent. on the other. Did he make a profit on the whole transaction, or a loss? And how much?
Solution
Commit an attempt to unseal the proof. Write your answer — right or wrong, thinking it through is the point.
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