Answer
$K=7.2$
Work Step by Step
The dielectric constant is given as
$K=\frac{q}{\epsilon_{\circ}EA}$
Plugging in the known values, we obtain
$K=\frac{8.9\times10^{-7}}{8.85\times10^{-12}(1.4\times10^6)(100\times10^{-4})}$
$K=7.18$
After rounding off, we get
$K=7.2$
