Bmat 2021 dna q

Could someone help show me the calculation that would lead to this answer?

Hi!

the three sub-units are base + ribose + phosphate
600 sub-units /3= 200 nucleotides
28 A so 28 T
leaving us with 72 C and 72 G

the question asks for % of sub-units
so 72/600 total number sub-units = 12/100

Hope this helps!

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