A solute A dimerizes in water. The boiling point of a 2 molal solution of A is 100 . 52 C ∘ . The…

A solute $\mathrm{A}$ dimerizes in water. The boiling point of a $2$ molal solution of $\mathrm{A}$ is $100.52{}^{\circ }\mathrm{C}$. The percentage association of $\mathrm{A}$ is ___ .
(Round off to the Nearest integer)

 Use : ${\mathrm{K}}_{\mathrm{b}}$ for water $=0.52 \mathrm{K} \mathrm{kg}{ \mathrm{mol}}^{-1}$ 

            Boiling point of water $=100°\mathrm{C}$