What is the value of 1 line in the area of 20-50?

What is the value of 1 line in the area of 0-2?

What is the value of 1 line in the area of 10-20

What is the value of 1 line in the area of 300-500

What is the value of 1 line in the area of 100-200?

What is the value of 1 line in the area of 50-100?​