0.2 &amp; = 0.2 \times 100 \times \left (\frac{1} {100}\right ) &amp; &amp; \text{Ya que} \ 100 \times \left (\frac{1} {100}\right ) = 1\\0.2 &amp; = 20 \times \left (\frac{1} {100}\right ) \\0.2 &amp; = \left (\frac{20} {100}\right ) = 20\%