Practice question

Question

A DNA solution of 50 μg mL⁻¹ concentration gives an absorbance of 1.0 at 260 nm. An aliquot of 20 μL from a 50 μL purified plasmid solution is diluted with distilled water to a total volume of 1000 μL. The diluted plasmid solution gives an absorbance of 0.550 at 260 nm. The concentration of the purified plasmid in μg μL⁻¹ (rounded off to two decimal places) is ___