4. When determining Mn in steel, a 0.200 g sample of it was dissolved, Mn was oxidized to MnO4 and the solution was diluted to 0.200 ml. Photometry was carried out by a differential comparison method with a standard solution Cst = 20 mg/l and a zero solution with a KMnO4 concentration of 0.0005 N. The optical densities of the test solution and the standard solution relative to zero were respectively Ast = 0.28; Ax = 0.15.
Determine the Mn content in steel in %.

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