In Jacob’s statistics class, the final grade is a weighted mean of a homework grade, three midterm exam grades, and a final exam grade. The homework counts for 10% of the final grade, each midterm counts for 20%, and the final exam counts for 30%. Jacob got a score of 70 on the homework, 60, 75, and 85 on the three midterms, and 80 on the final. What is Jacob’s final grade?