Significance:
GC content correlates with genome stability, melting temperature (Tm) of DNA duplexes, and even organism ecology (thermophiles tend to have GC-rich genomes because G–C pairs have 3 hydrogen bonds vs. 2 for A–T, making them more heat-stable). It's a mandatory field in PCR primer design software and genome-assembly QC reports.
Statement
Given a DNA string, compute its GC content as a percentage: `(count(G) + count(C)) / length × 100`, rounded to exactly 2 decimal places.
- `1 ≤ length(DNA) ≤ 1000` - Round using standard "round half to even" or "round half up" — test cases avoid the ambiguous .005 boundary, so either is fine
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