Fred bought a 2000 ml bottle of Coke and drank 5% of it on the first day and replaced it with water. On the second day he drank 10% of the contents and replaced it with water. On the third day he drank 15% and replaced it with water. He continued in this way and drank the whole bottle on the 20th day. Find the average quantity of water (in ml) that Fred drank in these 20 days from the bottle.


I've come to 950, Considering that 1900 is the last term. Fundamentally in terms of percentage 95% water & 5% coke is what I've presumed. Please correct me if the approach is wrong.