[tex]\bf \cfrac{original\ price}{increased\ price}\qquad \cfrac{6.6}{11}\implies \cfrac{\frac{66}{10}}{\frac{11}{1}}\implies \cfrac{66}{10}\cdot \cfrac{1}{11}\implies \cfrac{6}{10}\cdot \cfrac{1}{1}\implies \cfrac{6}{10}
\\\\\\
\cfrac{3}{5}\qquad 3:5[/tex]
