You know that your total amount equals to 100% Complementary bases are usually present in equal amounts so if you have 32% thymine then you have 32% of adenine 32% times two equals 64% 100% - 64% = 36% This means that you have 36% left for cytosine and guanine 36% / 2 = 18% So you have 18% guanine 18% cytosine 36% thymine 36% adenine
