Bahncard/Comparing costs/Exercise

A Bahncard ${}25$ costs ${}62$ Euros and allows for one year to save ${}25$ percentage of the standard price for the travels. A Bahncard ${}50$ costs ${}255$ Euros and allows for one year to save ${}50$ percentage of the standard price for the travels. Determine for which standard price no Bahncard, the Bahncard ${}25$ or the Bahncard ${}50$ is the best option.

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