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[tex]\begin{aligned} \small{\sf 4,21 - 15\% - \frac{5}{20}} &= \small{\sf \frac{421}{100} - \frac{15}{100} - \frac{5}{20}} \\ \\ &= \small{\sf \frac{421}{100} - \frac{15}{100} - \frac{5 \times 5}{100}} \\ \\ &= \small{\sf \frac{421}{100} - \frac{15}{100} - \frac{25}{100}} \\ \\ &= \sf \frac{421 - 15 - 25}{100} \\ \\ &= \sf \frac{381}{100} \\ \\ &= \boxed{\red{\sf 3,81→ Opsi. a}} \end{aligned}[/tex]
