请用json格式回答这道数学题：多少的72%是36？
user
```json
{
  "problem": "多少的72%是36？",
  "solution": {
    "formula": "x * 0.72 = 36",
    "calculation": "x = 36 / 0.72",
    "result": 50
  },
  "interpretation": "50的72%等于36"
}
```
assistant