A DNA solution of 50 \(\mu\)g mL\(^{-1}\) gives absorbance of 1.0 at 260 nm. A 20 \(\mu\)L aliquot from a 50 \(\mu\)L purified plasmid solution is diluted to 1000 \(\mu\)L. The diluted solution gives absorbance 0.550 at 260 nm. The purified plasmid concentration in \(\mu\)g \(\mu\)L\(^{-1}\) (rounded to two decimals) is \(\underline{\hspace{1cm}}\).