$$B=\frac{3.3\times10^{3}\times4\times10^{-3}}{16\times1^{7}}$$
$B=0.825$
$$B=\frac{3.3\times 10^{-3}\times 10^{3}}{4\times 1^{7}}$$
$$B=\frac{3.3\times \frac{1}{1000}\times 10^{3}}{4\times 1^{7}}$$
$$B=\frac{\frac{33}{10000}\times 10^{3}}{4\times 1^{7}}$$
$$B=\frac{\frac{33}{10000}\times 1000}{4\times 1^{7}}$$
$$B=\frac{\frac{33}{10}}{4\times 1^{7}}$$
$$B=\frac{\frac{33}{10}}{4\times 1}$$
$$B=\frac{\frac{33}{10}}{4}$$
$$B=\frac{33}{10\times 4}$$
$$B=\frac{33}{40}$$
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$B≔0.825$
