What fraction of the volume of an iceberg (density 917 kg/m3) would be visible if the iceberg floats?

(a) In the ocean (salt water, density 1024 kg/m3) and

(b) In a river (fresh water, density 1000 kg/m3)? (When salt water freezes to form ice, the salt is excluded. So, an iceberg could provide fresh water to acommunity.)