At 298 K, the molar conductivity of an $$x\%$$ (w/w) MX solution is 123.5 S cm$$^{2} mol^{-1}$$. The conductance of same solution is $$1.9 \times 10^{-3} S$$. The value of x is ______ $$\times 10^{-2}$$.
(Given: Cell constant = 1.3 cm$$^{-1}$$, molar mass of MX = 75 $$g mol^{-1}$$, density of aqueous solution of $$MX$$ at 298 K is 1.0 $$g mL^{-1}$$)