Final answer:
The current stock percentage is calculated by dividing the current stock level by the future stock level and then multiplying by 100 to convert the ratio into a percentage for the product with product_id = 21 in the retail.inventory table.
Step-by-step explanation:
To calculate the current stock percentage out of the future stock level for a product with a product_id = 21 using the retail.inventory table, you would typically perform the following steps:
- Retrieve the current stock level and the future stock level from the retail.inventory table for the product with product_id = 21.
- Divide the current stock level by the future stock level to get a decimal number representing the ratio.
- Multiply the resulting decimal by 100 to convert the ratio into a percentage.
The formula would look like this:
Current Stock Percentage = (Current Stock Level / Future Stock Level) × 100
It is important to ensure that the future stock level is not zero to avoid division by zero error.