In a car's hydraulic braking system, when the driver presses the brake pedal, a force of 45 N45\text{ N}45 N is applied normal to the surface of the master cylinder piston. The pressure transmitted through the brake fluid is 125 000 Pa125\,000\text{ Pa}125000 Pa.
Calculate the surface area of the piston. Give your answer in standard form and include the correct SI unit.