How to calculate CPU% Usage?

I followed this docs: https://docs.digitalocean.com/reference/api/api-reference/#operation/monitoring_get_DropletCpuMetrics And I got data like this:

{
    "status": "success",
    "data": {
        "resultType": "matrix",
        "result": [
            {
                "metric": {
                    "host_id": host_id,
                    "mode": "idle"
                },
                "values": [
                    [
                        1708955160,
                        "836680.1399999999"
                    ],
                    [
                        1708955280,
                        "836918.48"
                    ]
                ]
            },
            {
                "metric": {
                    "host_id": host_id,
                    "mode": "iowait"
                },
                "values": [
                    [
                        1708955160,
                        "529.21"
                    ],
                    [
                        1708955280,
                        "529.51"
                    ]
                ]
            },
            {
                "metric": {
                    "host_id": host_id,
                    "mode": "irq"
                },
                "values": [
                    [
                        1708955160,
                        "0"
                    ],
                    [
                        1708955280,
                        "0"
                    ]
                ]
            },
            {
                "metric": {
                    "host_id": host_id,
                    "mode": "nice"
                },
                "values": [
                    [
                        1708955160,
                        "18.490000000000002"
                    ],
                    [
                        1708955280,
                        "18.490000000000002"
                    ]
                ]
            },
            {
                "metric": {
                    "host_id": host_id,
                    "mode": "softirq"
                },
                "values": [
                    [
                        1708955160,
                        "24.68"
                    ],
                    [
                        1708955280,
                        "24.689999999999998"
                    ]
                ]
            },
            {
                "metric": {
                    "host_id": host_id,
                    "mode": "steal"
                },
                "values": [
                    [
                        1708955160,
                        "102.99000000000001"
                    ],
                    [
                        1708955280,
                        "103.00999999999999"
                    ]
                ]
            },
            {
                "metric": {
                    "host_id": host_id,
                    "mode": "system"
                },
                "values": [
                    [
                        1708955160,
                        "759.1199999999999"
                    ],
                    [
                        1708955280,
                        "759.5699999999999"
                    ]
                ]
            },
            {
                "metric": {
                    "host_id": host_id,
                    "mode": "user"
                },
                "values": [
                    [
                        1708955160,
                        "948.6099999999999"
                    ],
                    [
                        1708955280,
                        "949.23"
                    ]
                ]
            }
        ]
    }
}

How can I calculate the cpu% usage? this is my function:

def get_cpu_usage(host_id, start_time, end_time, token)
  uri = URI("https://api.digitalocean.com/v2/monitoring/metrics/droplet/cpu")
  uri.query = URI.encode_www_form({ host_id: host_id, start: start_time, end: end_time })

  request = Net::HTTP::Get.new(uri)
  request["Content-Type"] = "application/json"
  request["Authorization"] = "Bearer #{token}"
  response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) do |http|
    http.request(request)
  end

  if response.code == '200'
    data = JSON.parse(response.body)

  else
    puts "Failed to fetch droplet metrics. HTTP Error #{response.code}: #{response.message}"
  end
end