Bill sanity-checker

The fish is eaten and the bill has arrived. Put the board price and the weight on the bill back together and see whether the fish line matches.

This checker needs JavaScript. The maths is simple though: the fish line should be the board price per kilo × the weight in kilos. A bill showing 900 g at 58 €/kg should read 0.9 × 58 ≈ €52 for the fish.