The complement of 10% can indeed be 0.90.
What is a percentage?
The percentage represents a rate between 0 and 100% of 0 to 1. Due to this, if two percentages complement each other the total sum should always be 100 or 1.
What is the complement of 10%?
The regular complement of 10% is 90% (100% - 10% = 90%). However, if you use the rate 0 to 1, 10 represents 0.10. This means 1 - 0.10 = 0.90. So, the complement is also 0.90.
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