On Monday, Millie puts 2 liters of seeds, 30% of which are nyjer seeds. On each successive day she adds another 2 liters of the same mix of seeds without removing any seeds that are left. Each day the birds eat only 20% of the nyjer seeds in the feeder, but they eat all of the other seeds. On which day, just after Millie has placed the seeds, will the birds find that more than 50% of the seeds in the feeder are nyjer seeds?