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

Correct Answer: Option C — 1.04 feet downward

Final KG is calculated using standard summation of vertical moments: (Initial Displacement * Initial KG - Weight Removed * Vertical Arm) / Final Displacement. Discharging 300 LT at 120 feet from 20,000 LT displacement lowers the vertical center of gravity by 1.04 feet.