$A{B}_2$ is 10% dissociated in water to $A^{2+}$ and  $B^{-}$. The boiling point of a 10.0 molal aqueous solution of  $A{B}_2 {\text{\hspace{0.17em}is }}^{0}C$. (Round off to the nearest integer).
[Given: Molal elevation constant of water $K_b=0.5K{\text{\hspace{0.17em}kg\hspace{0.17em}mol}}^{-1}$, boiling point of pure water $={100}^{0}C$]