If $$1000\textbackslash\%$$ of a certain number is $$100$$, the certain number is． 
Overseas Competition->Knowledge Point->Word Problem Modules->Solving Problems Involving Fractions and Percentages->Finding the Base
If $$1000\textbackslash\%$$ is $$100$$, then $$\left(\frac{1}{10}\right)\text{th}$$ of that, $$10$$, is $$100\textbackslash\%$$ of the number. 