A cylindrical siltstone specimen was obtained from a borehole drilled in a site where a high-rise building is proposed to be constructed. A laboratory unconfined compressive strength (UCS) test was carried out on this specimen to estimate its strength properties. It was found that the specimen failed at a normal load of 52.9 kN. The height and diameter of the specimen was measured to be 100 mm and 50mm respectively.

Using the provided data,

Calculate the Normal stress (σ₁) at failure.

(Type your answer in MPa)