Hi, want to calculate % at aggregate level or group by....Pls. help

30+% = 30+DPD/AUM

how to show 30+% ...option getting is SUM, Count, Min, Max, Any, Average

Data set as below:

|AUM | 30+ DPD | 30+%|

|100 | 0 | |

|80 | 0 | |

|200 | 0 | |

|120 | 0 | |

|20 | 30 | |

|100 | 0 | |

|20 | 20 | |

|500 | 0 | |

|200 | 0 | |

|70 | 0 | |

Total

|1410 | 50 | **3.5%**|