Choose $m = 100$, $x = 25$

$y =$ $\frac{25}{(1-25/100)}$
$y =$ $\frac{25}{(3/4)}$
$y = 25 * \frac{4}{3}$
$y = \frac{100}{3}$

$y = 33.3$
$y = \frac{1}{3}$

So $m$ depreciates by 25%. That means:

$100(1-\frac{1}{4})$
$100(\frac{3}{4})$

$100(\frac{3}{4})$ is the price after the depreciation. We're keeping this the way it is, and you'll see why next.

After the depreciation, the new price appreciated by y%. This means that:

$100(\frac{3}{4})(\frac{4}{3})$ =

$100$.

So in the end, the price never changed.

The answer is B