Is delaying prayer to prepare food for customers at the the time of Maghrib call to prayer during Ramadan sinful?

The time for Maghrib prayer begins with sunset and ends with the disappearance of the red twilight. If you delay the Maghrib prayer from its beginning time and pray it before the entry of the Isha prayer time, there is no sin upon you, though it is preferable to perform it at the beginning of its time. However, delaying it until the Isha prayer time enters is not permissible, neither in Ramadan nor at any other time.