LAMBDA and Custom Function CreatorPREMIUM

Help me create a custom LAMBDA function:

**Function Purpose:**
[Describe what calculation or operation you want to create as a reusable function]

**Parameters Needed:**
| Parameter | Description | Data Type |
|-----------|-------------|-----------|
| [e.g., price] | [e.g., Original price] | [Number] |
| [e.g.,…