curl --request POST \
  --url https://api.iotools.cloud/v1/tool/contribution-margin-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "sellingPrice": "50",
  "variableCost": "30",
  "unitsSold": "1000",
  "fixedCosts": "12000",
  "targetProfit": ""
}
'

{
  "tool": "contribution-margin-calculator",
  "tool_version": "1.0.2",
  "outputs": {
    "resultTable": [
      {
        "metric": "Unit Contribution Margin",
        "value": "$20.00"
      },
      {
        "metric": "Contribution Margin Ratio",
        "value": "40.00%"
      },
      {
        "metric": "Total Revenue",
        "value": "$50,000.00"
      },
      {
        "metric": "Total Variable Cost",
        "value": "$30,000.00"
      },
      {
        "metric": "Total Contribution Margin",
        "value": "$20,000.00"
      },
      {
        "metric": "Operating Profit",
        "value": "$8,000.00"
      },
      {
        "metric": "Break-Even Units",
        "value": "600 units"
      },
      {
        "metric": "Break-Even Sales",
        "value": "$30,000.00"
      },
      {
        "metric": "Margin of Safety (Units)",
        "value": "400.00 units"
      },
      {
        "metric": "Margin of Safety (%)",
        "value": "+40.00%"
      }
    ]
  },
  "credits_used": 5,
  "credits_remaining": null
}