A mother cut a cake into $$12$$ equal slices. Her four children had a slice each and she had one too. Later, a neighbour ate four slices. What percentage of the cake was left at the end of the day? 
Overseas Competition->Knowledge Point->Word Problem Modules->Solving Problems Involving Fractions and Percentages->Finding the Rate
$12-(4\times1)-1-4=3$  $\frac{3}{12}\times100\textbackslash\%=25\textbackslash\%$ 