mml=<math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle mathsize="12px"><mrow><mfenced open="[" close="]" separators="|"><mrow><mi mathvariant="normal">x</mi><mo>+</mo><mi mathvariant="normal">y</mi><mo>+</mo><mfrac><mi>xy</mi><mn>100</mn></mfrac></mrow></mfenced><mi mathvariant="normal">%</mi></mrow></mstyle></math>