Key TakeawaysCitigroup on Friday reported second-quarter profit that exceeded expectations.The bank's net income jumped 10% year-over-year to $3.2 billion, or $1.52 per diluted share.Revenue increased 4% after a strong showing from the banking and trading businesses.Citi's operating expenses, in the spotlight after ending its restructuring program, declined 2%. Citigroup (C) on Friday reported second-quarter profit that beat analysts' estimates. Citi's net income of $3.2 billion was 10% higher than the year ...