What would be the percentages of the other bases in each sample?

Question

this is the complete question:

analysis of four double-stranded DNA samples yielded the following information:

sample1-35%cytosine, sample2-28%guanine, sample3-15%thymine, sample4-12%adenine

a.what would be the percentages of the other bases in each sample?

b.could any of these samples come from the same organism?

Answer 1

sample 1: 35% C, 35% G, 15% T, 15% A

sample 2: 28% G, 28% C, 22% T.  22% A

sample 3. 15% T, 15% A, 35% C, 35% G

sample 4. 12% A, 12% T, 38% C, 38% G

Sample 1 and sample 3 are from the same organism.

Answer 2

sample 1 35% CG and 15% AT

sample 2 56% CG and 22% AT

sample 3 35% CG and 15% AT

sample 4 38% CG and 12% AT

Yes, sample 1 and 3