The Beer's Law plot for the ferroin complex is shown below.

What is the concentration of $F{e}^{2+}$ in ppm if an unknown solution has an average absorbance of $0\mathrm{.}75?$

$2\mathrm{.}62ppm$

$2\mathrm{.}6ppm$

$2\mathrm{.}15{10}^{-2}ppm$

$2\mathrm{.}145{10}^{-2}ppm$