The writing on the left expresses the fraction on the right.
In that case, what number should go in the empty space at the bottom-right?
The writing on the left is not a fraction.
Try slanting the writing on the left a little.
The writing at the top-left says '10%', which is the same as 1/10.
The writing at the bottom-left says '1%'.
How could that be written as a fraction with '1' at the top?
The answer is '100'.