I think it's like this,
Extra - essential = 4999 - 2999 = 2000 * 2.5 = 5000
deluxe - essential = 5749 - 2999 = 2750 * 2.5 = 6875
Still confused whether to upgrade to extra or deluxe coz they've added remasters/remake to classic catalogue, can someone confirm whether it's working with extra or not