Priya pours 1 litre of water into the pot. Therefore, Priya pours in 1000 ml of water.
The amount of water seeped out is 450 ml.
Therefore, 1000 - 450 = 550 ml is retained by the soil.
The weight of soil is 1.5 kg = 1500 g.
Percentage of water absorbed = = 55%
Water absorbed as a percentage of soil weight = = 36.67%