In a sample of double-stranded DNA, 30 \%30%30, percent of the nitrogenous bases are adenine (A). What percentage of the nitrogenous bases in the sample are thymine (T)?

The number of thymine (T) should be the same as adenine(A). That means we have 30% A and 30%T. 100-30-30=40%(G and C). Guanine(G) and cytosine(C) are also equal in number so we have 30%A(adenine) 30%T(thymine) 20%G(guanine) and 20%C(cytosine)

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