One site added 0.5 million new accounts everyday. At this rate how many days will it take to add 25 million new accounts

Site added 0.5 million acc each day

Let us suppose site added 0.5 million acc on day 1

on day 2 new 0.5 acc would be added and 0.5 acc from day 1 are already present so total acc would be 0.5+0.5=1 million

So 1 million acc are added every 2 days

in this pattern 25 million acc would be added in 50 days