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A square mesh of 4.00 x 4.00 mm is engraved on the surface of a thin metal plate. The plate is deformed plastic by biaxial tension and it is found that the grid has been converted into a rectangular dimension of 4.08 x 4.20 mm. Calculate the ratio of the main stresses in the plane of the plate and the plastic strain in the direction perpendicular to the plate. The material is considered rigid-plastic.