**Final Answer:**
The answer to 432.5 - 24.3984 is 408.1016, with five significant figures.
**Explanation:**
Subtracting 24.3984 from 432.5 gives us:
432.5
- 24.3984
______________
408.1016
To determine the number of significant figures, consider the rules:
- When subtracting or adding numbers, the result should have the same number of decimal places as the least precise value.
- In this case, both 432.5 and 24.3984 have five significant figures.
The result, 408.1016, has six decimal places due to the subtraction. However, after considering significant figures, trailing zeros aren't counted unless they are after the decimal point. Therefore, the answer retains five significant figures (4, 0, 8, 1, 0), reflecting the precision of the least precise value used in the subtraction (24.3984). Hence, the final answer, 408.1016, contains five significant figures to represent the level of precision accurately.