To find the concentration of the solution, we need to calculate the amount of oil in the solution relative to the total volume of the solution:
Concentration = (amount of oil / total volume of solution) x 100%
The amount of oil in the solution is 50 mL, and the total volume of the solution is 100 mL + 50 mL = 150 mL (since the oil is dissolved in 100 mL of gasoline).
So, the concentration of the solution is:
Concentration = (50 mL / 150 mL) x 100% = 33.33%
Therefore, the concentration of the solution is 33.33%.