Part of the original problem seems to assume that each bartender will, at the end of the evening, have a till that balances.
This would appear to rely on his till having the correct number of 'polys' to be able to check that the closing number of polys in his till, minus the starting number of 'polys' in his till equate to the total value of drinks sold.
Unfortunately, to make this work, he has to assign different values to Polydor polys & Polythene polys. The relative value of these polys is purely a matter of viewpoint.

Re-calculate using a "hard" currency which will have realistic exchange rates against both currencies.



Once again, THERE IS NO PARADOX IN THE ORIGINAL QUESTION. IT IS BASED ON A FALSE PREMISE!