If a cell contains 38% Guanine in its DNA, how much Cytosine does it have? How much Adenine?

C and G are same and A and T are same. So If G has 38% then C is also 38%. I you add those together it makes 76%, then 100-76=24/2=12, so A and T are both 12%. If you add everything together it should equal 100%