Rumus 3 3/4 x 2,1 x 20%

3 3/4 = 3,75
20% = 0,2
= 3,75 × 2,1 × 0,2
= 7,875 × 0,2 = 15,750

[tex]3 \frac{3}{4} \times 2.1 \times \frac{20}{100} \\ = \frac{15}{4} \times 2.1 \times \frac{1}{5} \\ = \frac{31.5}{20} \\ = 1 \frac{11.5}{20} \\ = 1.575[/tex]
Semoga bermanfaat.....
-Prisco