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Solution:
Starboard winter load line = 60mm above
Port winter load line = 20mm below
Mean draft = ( 60 – 20)/2
= (40/2)
= 20mm
= 2cm

Summer SW draft = 7.2m( given)
We know that:
Waterline (W) = (1/48 of summer draft)
=(1/48 x 7.2)
= 0.15m
= 15cm
Total sinkage available to bring the vessel to her tropical load line = ( 2+ 15 + 15)
= 32cm
TPC =20( given)
So, Cargo can be load = (TPC x sinkage)
=(20 x 32)
= 640t.