The percentage change is: $$\begin{array}{llll}\hfill \frac{175-320}{320}& \approx -0.453& \hfill & \\ \hfill & =-45.3\text{\%}& \hfill & \end{array}$$

This means that the change in value was $-45.3\text{\%}$. You got a negative percentage, meaning that the Playstation declined in value. It has fallen by $45.3\text{\%}$ in value.

The percentage change is: $$\begin{array}{llll}\hfill \frac{5200-5000}{5000}& =0.04& \hfill & \\ \hfill & =4\text{\%}& \hfill & \end{array}$$

The percentage change is $4$ %. Since you found a positive number, the money you deposited has grown in value by $4$ %.

You have to calculate the percentage change. $$\begin{array}{llll}\hfill \frac{420000-350000}{350000}& =0.20& \hfill & \\ \hfill & =20\text{\%}& \hfill & \end{array}$$

In four years the value of the house has grown by $20$ %.