Sodium oxalate, Na₂C₂O₄, in solution is oxidized to CO₂( g) by MnO₄¯, which is reduced to Mn²⁺. A 50.1-mL volume of a solution of MnO₄¯ is required to titrate a 0.339-g sample of sodium oxalate. This solution of MnO₄¯ is used to analyze uraniumcontaining samples. A 4.62-g sample of a uranium-containing material requires 32.5 mL of the solution for titration. The oxidation of the uranium can be represented by the change UO²⁺ → UO₂ ²⁺. Calculate the percentage of uranium in the sample.