=+76. A factory uses three production lines to manufacture cans of a certain type. The accompanying table gives percentages of nonconforming cans, categorized by type of nonconformance, for each of the three lines during a particular time period:

Line 1 Line 2 Line 3 Blemish 15 12 20 Crack 50 44 40 Pull-tab problem 21 28 24 Surface defect 10 8 15 Other 4 8 2