What's 1*10^-14/4.2*10^-6?
1*10^-14/4.2*10^-6 =
[1/4.2] * 10^-14 / 10^-6 =
0.2380952380952381 * 10^6 / 10^14 =
0.2380952380952381 * 10^-8 =
2.380952380952381 * 10^-9 [ approx.]
