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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
​
</body>
</html>
 
const data = {
  "data": {
    "job": [
      {
        "jobNumber": "1",
        "jobTasks": {
          "jobTask": [
            {
              "total": { "amountString": "10.00" }
            },
            {
              "total": { "amountString": "10.00" }
            }
          ]
        }
      },
      {
        "jobNumber": "2",
        "jobTasks": {
          "jobTask": [
            {
              "total": { "amountString": "20.00" }
            },
            {
              "total": { "amountString": "20.00" }
            }
          ]
        }
      },
      {
        "jobNumber": "3",
        "jobTasks": {
          "jobTask": [
            {
              "total": { "amountString": "30.00" }
            },
            {
              "total": { "amountString": "30.00" }
            }
          ]
        }
      }
    ]
  }
}
​
let string = "";
​
data.data.job.forEach((item) => {
  const sum = item.jobTasks.jobTask.reduce((total, i) => parseFloat(i.total.amountString) + total, 0);
  string += `jobNumber: ${item.jobNumber}: Total ${sum}. `;  
});
console.log(string);
Output

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