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JavaScript

const raw = [{
  "device_info": {
    "device_id": "598abf4b1d41c8084d367508",
    "name": "Cam01",
    "serial_no": "00E0B4141D35",
    "entrance_name": "South Gate"
  },
  "age_data": [{
    "age_range": "0-20",
    "total_count": 26,
    "male_count": 13,
    "female_count": 13
  }, {
    "age_range": "21-30",
    "total_count": 922,
    "male_count": 452,
    "female_count": 470
  }, {
    "age_range": "31-40",
    "total_count": 226,
    "male_count": 184,
    "female_count": 42
  }, {
    "age_range": "41-50",
    "total_count": 13,
    "male_count": 1,
    "female_count": 12
  }, {
    "age_range": "51-0",
    "total_count": 7,
    "male_count": 1,
    "female_count": 6
  }]
}, {
  "device_info": {
    "device_id": "598d6cf56803fa66068b4567",
    "name": "Cam02",
    "serial_no": "00E0B413FE4D",
    "entrance_name": "North Gate3"
  },
  "age_data": [{
    "age_range": "0-20",
    "total_count": 3,
    "male_count": 1,
    "female_count": 2
  }, {
    "age_range": "21-30",
    "total_count": 90,
    "male_count": 58,
    "female_count": 32
  }, {
    "age_range": "31-40",
    "total_count": 46,
    "male_count": 32,
    "female_count": 14
  }, {
    "age_range": "41-50",
    "total_count": 11,
    "male_count": 1,
    "female_count": 10
  }, {
    "age_range": "51-0",
    "total_count": 4,
    "male_count": 1,
    "female_count": 3
  }]
}]

const temp = {
  "female": [],
  "male": []
};

let total_male_count = 0,
  total_female_count = 0
raw.forEach(obj => {
  obj.age_data.forEach(obj2 => {
    total_male_count += obj2.male_count
    total_female_count += obj2.female_count
  })
})

const prepare_femaleObj = raw.map((obj, i) => {
  const female_count = obj.age_data.reduce((accum, obj2) => {
  	if(obj2.female_count) return accum + obj2.female_count
  }, 0)
  
  const percentage = female_count / total_female_count * 100
  
  return { id: ++i, camera: obj.device_info.name + ' - ' + obj.device_info.entrance_name, percentage }
})

const prepare_maleObj =...