Evaluate: \(\frac{0.21 \times 0.072 \times 0.00054}{0.006 \times 1.68 \times 0.063}\)
A
0.01286
B
0.01285
C
0.1286
D
0.1285
Verified Correct Answer: A.
Step-by-Step Mathematical Solution
\(\frac{0.21 \times 0.072 \times 0.00054}{0.006 \times 1.68 \times 0.063}\)
= \(\frac{9 \times 10^{-10}}{7 \times 10^{-8}}\)
= \(1.2857 \times 10^{-2}\)
= \(0.012857 \approxeq 0.01286\) (to 4 s.f)
Source: Myschool Past Questions Archive (Record #2878)