If a DNA sample contains 13% adenine,what percentage of the sample contains cytosine?

Name: If a DNA sample contains 13% adenine,what percentage of the sample contains cytosine?
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According to Chargaff's rules, the amount of adenine (A) equals thymine (T), and the amount of cytosine (C) equals guanine (G) in DNA. If adenine is 13%, then thymine is also 13%. This leaves 74% for cytosine and guanine combined. Since cytosine and guanine are equal, cytosine is 37%.

If a DNA Sample Contains 13% Adenine,what Percentage of the Sample