a) $\frac{2}{{50}} = \frac{{2 \times 2}}{{50 \times 2}} = \frac{4}{{100}} = 4\% $
b) $\frac{{17}}{{20}} = \frac{{17 \times 5}}{{20 \times 5}} = \frac{{85}}{{100}} = 85\% $
c) $\frac{{12}}{8} = \frac{3}{2} = \frac{{3 \times 50}}{{2 \times 50}} = \frac{{150}}{{100}} = 150\% $
d) $\frac{6}{{75}} = \frac{2}{{25}} = \frac{{2 \times 4}}{{25 \times 4}} = \frac{8}{{100}} = 8\% $
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