A semisubmersible with a displacement of 20,000 tons and KG of 52 feet discharges 300 long tons of barite from P-tanks located 120 feet above the keel. Ballast added to maintain draft has a VCG of 20 feet. What is the change in KG?

Correct Answer: Option C — 1.50 feet decrease

Discharging barite (300 LT at 120 ft) and adding ballast (300 LT at 20 ft) keeps displacement constant. Net change in vertical moments is -(300 × 120) + (300 × 20) = -30,000 ft-tons. Dividing by displacement (20,000 LT) results in a 1.50-foot decrease in KG, adhering to standard stability principles under 46 CFR.