Answer:
Perimeter is C. 100 cm.
Explanation:
Perimeter is the length of the border of the shape. To find perimeter, find the length of all the walls and add them up. One wall is 20 cm, another is 5 cm, 30 cm, 16 cm, 4 cm, and the last one is 25. Add them up to get 100 cm.
I found length 25 cm and length 4 cm by doing 30-5=25 cm and 20-16=4 cm.
Look at this photo for reference.