How to calculate the percentage between two numbers?

Question

Assiming the firt is always the bigger one and the second is the smallest

how to calculate the percentage between them, ex:

100, 25 = 25%

thanks

Answer 1

Hint:

$25\%$ means $\frac{25}{100}$, so if

$$ 100,25 \rightarrow \frac{25}{100} \rightarrow 25\% $$ we have also $$ 50,25 \rightarrow \frac{25}{50}=\frac{50}{100} \rightarrow 50\% $$