## To determine the appropriate way to present the answer, we need to clarify what is meant by "presentation." Are you asking for the format or style in which the information should be presented, or are you referring to how the answer should be calculated?

Assuming you are referring to the format of the answer, the appropriate presentation would depend on the context in which it is being presented. Here are a few options:

1. Decimal format: The smoke inhaled from a cigarette contains approximately 0.04% carbon monoxide.

2. Fraction format: The smoke inhaled from a cigarette contains about 4/10,000 (equivalent to 1/2500) carbon monoxide.

3. Scientific notation: The smoke inhaled from a cigarette contains roughly 4.0 x 10^(-4) carbon monoxide.

It's important to note that these presentations are interchangeable and can be used based on personal preference or specific formatting requirements.

If you meant the calculation involved in determining the answer, we can proceed as follows:

To calculate the appropriate presentation, we need to convert the percentage to a decimal. To do this, divide the percentage by 100.

0.04% divided by 100 = 0.0004 (equivalent to 4/10,000)