Calcular pensión invalidez total

Tengo problemas para calcular una pensión por incapacidad total Se supone que le pertenece el 75% de la base reguladora, pero por mas que intento calcularlo, no soy capaz... ¿Podéis ayudarme? He preparado las bases y el IPC de cada mes...

<table width="240" border="0" cellspacing="0" cellpadding="0"><colgroup><col style="width: 60pt;" span="3" width="80" /> </colgroup><tbody><tr style="height: 15.0pt;"><td style="height: 15.0pt; mso-ignore: colspan; width: 120pt;" colspan="2" width="160" height="20">Edad 63 años</td><td style="width: 60pt;" width="80"> </td></tr><tr style="height: 15.0pt;"><td style="height: 15.0pt; mso-ignore: colspan;" colspan="2" height="20">Años cotizados 41</td><td> </td></tr><tr style="height: 15.0pt;"><td style="height: 15.0pt; mso-ignore: colspan;" colspan="2" height="20">Enfermedad común</td><td> </td></tr><tr style="height: 15.0pt;"><td style="height: 15.0pt;" height="20"> </td><td> </td><td> </td></tr><tr style="height: 15.0pt;"><td style="height: 15.0pt;" height="20"> </td><td>96 MESES</td><td>IPC</td></tr><tr style="height: 15.0pt;"><td class="xl65" style="height: 15.0pt;" align="right" height="20">jul-06</td><td align="right">809,4</td><td align="right">4</td></tr><tr style="height: 15.0pt;"><td class="xl65" style="height: 15.0pt;" align="right" height="20">ago-06</td><td align="right">809,4</td><td align="right">3,7</td></tr><tr style="height: 15.0pt;"><td class="xl65" style="height: 15.0pt;" align="right" height="20">sep-06</td><td align="right">809,4</td><td align="right">2,9</td></tr><tr style="height: 15.0pt;"><td class="xl65" style="height: 15.0pt;" align="right" height="20">oct-06</td><td align="right">809,4</td><td align="right">2,5</td></tr><tr style="height: 15.0pt;"><td class="xl65" style="height: 15.0pt;" align="right" height="20">nov-06</td><td align="right">809,4</td><td align="right">2,6</td></tr><tr style="height: 15.0pt;"><td class="xl65" style="height: 15.0pt;" align="right" height="20">dic-06</td><td align="right">809,4</td><td align="right">2,7</td></tr><tr style="height: 15.0pt;"><td class="xl65" style="height: 15.0pt;" align="right" height="20">ene-07</td><td align="right">809,4</td><td align="right">2,4</td></tr><tr style="height: 15.0pt;"><td class="xl65" style="height: 15.0pt;" align="right" height="20">feb-07</td><td align="right">809,4</td><td align="right">2,4</td></tr><tr style="height: 15.0pt;"><td class="xl65" style="height: 15.0pt;" align="right" height="20">mar-07</td><td align="right">809,4</td><td align="right">2,5</td></tr><tr style="height: 15.0pt;"><td class="xl65" style="height: 15.0pt;" align="right" height="20">abr-07</td><td align="right">809,4</td><td align="right">2,4</td></tr><tr style="height: 15.0pt;"><td class="xl65" style="height: 15.0pt;" align="right" height="20">may-07</td><td align="right">809,4</td><td align="right">2,3</td></tr><tr style="height: 15.0pt;"><td class="xl65" style="height: 15.0pt;" align="right" height="20">jun-07</td><td align="right">809,4</td><td align="right">2,4</td></tr><tr style="height: 15.0pt;"><td class="xl65" style="height: 15.0pt;" align="right" height="20">jul-07</td><td align="right">809,4</td><td align="right">2,2</td></tr><tr style="height: 15.0pt;"><td class="xl65" style="height: 15.0pt;" align="right" height="20">ago-07</td><td align="right">809,4</td><td align="right">2,2</td></tr><tr style="height: 15.0pt;"><td class="xl65" style="height: 15.0pt;" align="right" height="20">sep-07</td><td align="right">809,4</td><td align="right">2,7</td></tr><tr style="height: 15.0pt;"><td class="xl65" style="height: 15.0pt;" align="right" height="20">oct-07</td><td align="right">809,4</td><td align="right">3,6</td></tr><tr style="height: 15.0pt;"><td class="xl65" style="height: 15.0pt;" align="right" height="20">nov-07</td><td...