If any solute 'A' dimerises in water at $1\,\mathrm{atm}$ pressure and the boiling point of this solution is $100.52^{\circ}\mathrm{C}$. If $2$ moles of A is added to $1\,\mathrm{kg}$ of water and $K_{b}$ for water is $0.52^{\circ}\mathrm{C\,kg\,mol^{-1}}$, calculate the percentage association of A