Daily measurements taken each evening at a lake indicate that the lake loses a constant volume of water equal to 0.25% of its remaining volume each day.

i) find the approximate % of lake that remains after 30 days

ii) Find the approximate number of days before the lake is at 75% of its original capacity

I hope this is the right thread to post this in, i'm really not sure ><

I would really appreciate some help with this question, thank you.