In an industrial hydraulic metal-shearing machine, a normal force of 72 kN72\text{ kN}72 kN is applied to a piston. The pressure in the hydraulic fluid is 3.2×107 Pa3.2 \times 10^7\text{ Pa}3.2×107 Pa.
Calculate the cross-sectional surface area of the piston. Give your answer in standard form and include the appropriate unit.