Martin used a coordinate plane to design the garden shown. Each unit on the grid represents 10 yards. How many yards of rope does Martin need to rope off the perimeter of the garden?
Enter your answer in the box.
100
(10, 80)
(100, 80)
50
(40, 30)
(70, 30)
(10, 30)
(100, 30)
(70, 10)
0
(40, 10)
50
0
100