4.0 x 10-3
5.0 x 10-2
2.0 x 10-1
5.0 x 10-3
Correct answer is A
\(\frac{(1.25 \times 10^{-4}) \times (2.0 \times 10^{-1})}{(6.25 \times 10^5)}\) = \(\frac{1.25 \times 2}{6.25}\) x 104 - 1 - 5
\(\frac{2.50}{6.25}\) x 10-2 = \(\frac{250}{625}\) x 10-2
0.4 x 10-2 = 4.0 x 10-3