Here's how I proceeded with this question
The larger cylinder has a volume of 25pi * 10^4
The smaller cylinder has a volume of 25pi*10^1
So the small cylinder is \frac{(10^1*100)}{10^4} i.e 1% of the larger cylinder
So the level will fall 0.1% of 25 feet which is .025
The larger cylinder has a volume of 25pi * 10^4
The smaller cylinder has a volume of 25pi*10^1
So the small cylinder is \frac{(10^1*100)}{10^4} i.e 1% of the larger cylinder
So the level will fall 0.1% of 25 feet which is .025