Help with math problem?

hello. I'm trying to figure out my grade in a cl. 30% of our grade is based off a midterm, 30% off a short paper, and 40% off a long paper. I got 60% on the midterm, 80% on the short paper, and 65% on the long paper. What will my grade be? please help me out and explain how you figured it out... I would really appreciate it!