A solution contains 50 g of common salt in 500 gm of water. Find...

Mass of solute (salt) = $50$ g

Mass of solvent (water) = $500$ g

Mass of solution = Mass of solute + Mass of solvent = $50 + 500 = 550$ g

Concentration of the solution = $\dfrac{\text{Mass of solute}}{\text{Mass of solution}} \times 100$

Concentration = $\dfrac{50}{550} \times 100 = \dfrac{100}{11} \approx 9.09\%$

The closest value among the given options is $9\%$.

Answer: $9\%$