mml=<math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle mathsize="12px"><mrow><mn>12000</mn><mi mathvariant="normal"></mi><msup><mfenced separators="|"><mfrac><mi mathvariant="normal">r</mi><mn>100</mn></mfrac></mfenced><mn>2</mn></msup><mo>=</mo><mn>172</mn><mo>.8</mo><mspace linebreak="newline"/><mo>&#x21D2;</mo><msup><mi mathvariant="normal">r</mi><mn>2</mn></msup><mo>=</mo><mfrac><mn>1728</mn><mn>12</mn></mfrac><mo>=</mo><mn>144</mn><mi mathvariant="normal"></mi><mi mathvariant="normal"></mi></mrow></mstyle></math>