An activated sludge plant runs a 30-minute settleometer test using a 1-L graduated cylinder. After 30 minutes, the settled sludge volume (SV30) reads 280 mL. The lab reports MLSS = 2,400 mg/L from the aeration basin sample. Extraneous data: RAS flow = 850 gpm and SRT = 10 days. Using SVI = (settled volume in mL/L × 1000) ÷ MLSS (mg/L), what is the Sludge Volume Index (SVI) in mL/g? (Note: a 1-L cylinder reading in mL is numerically equal to mL/L.)