According to the rule of Chargaff (based on complementarity)
The amount of adenine is equal to the amount of thymine, and guanine to cytosine: A = T, G = С.
The number of purines is equal to the number of pyrimidines: A + G = T + C.
As a result: (A + G) + (T + C) = 100%
The amount of guanine is equal to the amount of cytosine, which means = 20%, 60% remains for thymine and adenine, they are also the same amount, which means 30%.
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