$A$ wooden cubical block of mass $m = 20 \text{ kg}$ is measured within an error of $10 \text{ g}$. Its side length $l = 100 \text{ cm}$ is measured within an error of $1 \text{ mm}$. Then, the relative error in the measurement of its density is
- A$1.8 \times 10^{-2}$
- B$2.6 \times 10^{-2}$
- C$3.5 \times 10^{-3}$
- D$4.8 \times 10^{-3}$
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