Electrochemical cell

The electrochemical cell shown below is a concentration cell.

M I M2+ (saturated solution of a sparingly soluble salt, $MX_2$ ) II M2+ (0.001 mol dm $^{-3}$ ) I M

The emf of the cell depends on the difference in concentrations of M $^{2+}$ ions at the two electrodes. The emf of the cell at 298 K is 0.059 V.

The solubility product ( $K_{sp}: mol^3 dm^{-9}$ ) of $MX_2$ at 298 K based on the information available for the given concentration cell is (take 2.303 x R x 298/F = 0.059 V)