For 100 points: Agron doesn't say very much when he takes your money at the till. But then he doesn't need to, being a bit of a Superlogician. For example, the other day the Bursar turned up at the till with six VIP guests in tow, and the following brief conversation ensued.
Bursar: "This may be complicated. We all have different meals."
Agron: "Simples. You all pay different price."
Not a further word was spoken. Each of the seven handed over a pound, and without even looking at their trays, Agron handed back to each the correct change. The total amount of change distributed was 1.81.
What did the meals cost? And how did Agron know who wanted what?
As always, solutions should aim for accuracy, rigour, brevity, elegance and wit. The Editor's decision is final. Deadline High Noon on Friday. If no-one has solved it by then we will have a shoot-out at the OK Corral, known to you as LR23, at 5 o.clock. But you might care to call in then anyway.
-oOo-