A semisubmersible with a TPI of 11.25 long tons per inch discharges 270 long tons from amidships. What is the new mean draft if the original drafts were: Port Forward 69.5 feet; Port Aft 68.5 feet; Starboard Forward 71.5 feet; Starboard Aft 70.5 feet?

A
68'-0"
B
69'-10"
C
70'-2"
D
72'-0"
E