How to find base composition of the ds DNA

Chargaff s rules state that DNA from any cell of any organisms should have a 1:1 ratio (base Pair Rule) of pyrimidine and purine bases and, more specifically, that the amount of guanine should be equal to cytosine and the amount of adenine should be equal to thymine. , Genetics, DNA, Cytosine, Guanine, thymine, Adenine