1% of 1% of 25% 1000 is:

$$\eqalign{ & 1\% \,{\text{of}}\,1\% \,{\text{of}}\,25\% \,1000 \cr & = 1\% \,{\text{of}}\,1\% \,{\text{of}}\,\, {\frac{{ {25 \times 1000} }}{{100}}} \cr & = 1\% \,{\text{of}}\,1\% \,{\text{of}}\,250 \cr & = 1\% \,{\text{of}}\,\, {\frac{{ {1 \times 200} }}{{100}}} \cr & = 1\% \,{\text{of}}\,\,2.5 \cr & = \frac{{2.5}}{{100}} \cr & = 0.025 \cr} $$