Total Points from Projects in Round 2

At a recent science fair, students presented their projects on various topics, and their projects were evaluated by a panel of judges.

The results for three projects, represented in the line graph below, show the number of points scored by each project over three evaluation rounds:

Project A started with 30 points in Round 1, scored 50 in Round 2, and finished with 70 in Round 3. Project B began with 20 points, scored 40 in Round 2, and ended with 80 in Round 3. Project C scored 10 points in Round 1, 30 in Round 2, and 50 in Round 3.

What is the total number of points scored by all three projects in Round 2?