The correct option is C 50 cm, 100 cm
Given perimeter of the parallelogram = 300 cm.
Let the length of one side is x. As per the question, the other side will be 2x.
Hence, the perimeter of the parallelogram is
→ x + 2x + x + 2x = 300
→ 6x = 300
→ x = 50
Then, 2x = 2 ×50 = 100.
The lengths are 50 cm, 100 cm.