$$\frac{{25\% \,{\text{of}}\left( {50\% \,{\text{of }}30\% \,{\text{of }}150} \right)}}{{40\% \,{\text{of }}2250}}$$     is equal to:

$$\eqalign{ & \frac{{25\% \,{\text{of}}\left( {50\% \,{\text{of }}30\% \,{\text{of }}150} \right)}}{{40\% \,{\text{of }}2250}} \cr & = \frac{{25\% \times \left( {50\% \times 30\% \times 150} \right)}}{{40\% \times 2250}} \cr & = \frac{{25}}{{40}}\% \cr & = 0.625\% \cr} $$