Here's how to calculate the percent concentration of the solution:

1. Calculate the total mass of the solution:

* Total mass = Mass of AgNO3 + Mass of water

* Total mass = 54.0 g + 128 g = 182 g

2. Calculate the mass percent concentration:

* Mass percent concentration = (Mass of solute / Mass of solution) x 100%

* Mass percent concentration = (54.0 g / 182 g) x 100%

* Mass percent concentration ≈ 29.7%

Therefore, the percent concentration of the solution is approximately 29.7%.