7. A normal saline solution is 0.9% sodium chloride. Express that percent as a decimal.
Answer: C
0.009
To express 0.9% as a decimal, the percentage must be converted by dividing by 100. This results in 0.9% being equal to 0.009 as a decimal.
A) 0.09
This option is incorrect because 0.09 represents 9% when expressed as a percentage, which is significantly higher than the original 0.9%.
B) 9
This option is incorrect as it does not represent a decimal form of the percentage. Instead, it suggests a whole number which does not relate to the percentage given.
C) 0.009
This option is correct because 0.9% is equivalent to 0.009 when converted to decimal form by dividing 0.9 by 100.
D) 90
This option is incorrect since it suggests a whole number representation that is not relevant to expressing 0.9% as a decimal. It implies a value much larger than the original percentage.
Conclusion
The correct answer, 0.009, accurately reflects the conversion of 0.9% into decimal form. All other options fail to represent the correct decimal equivalent, either by being too high or misinterpreting the percentage entirely. Thus, C is the only valid option based on the mathematical conversion of the percentage.