Answer: Herbert's gross income is $100,910.
We include Herbert's salary when he was employed, unemployment compensation, dividends and winnings from lottery while calculating gross income. 
We don't include his withdrawal from savings accounts, but we consider the $60 interest he earned on his savings account. 
We also don't include any loans that he's taken in computing gross income.
So, Herbert's Gross Income will be:
Salary 90000 
Unemployment benefits + 8800 
Dividends + 550 
Winnings from lottery + 1500 
Interest earned on savings account + 60 
Gross Income (Total) 100910