ANSWER: $5,791
EXPLANATION: Dustin estimated that annually his college will cost him $7,721. He also knows that he will be receiving $1,930 as a grant for his college expenditure. So, subtracting the total cost of college by the grant he will receive, Dustin will figure out how much he will have to pay on his own. So mathematically, $7,721 - $1,930 = $5,791