The following are the maintenance costs incurred in a machine shop for six months with corresponding machine hours:

Month

Machine Hours

Maintenance Cost Rs.

July

4,000

600

August

4,400

640

September

3,400

540

October

4,800

680

November

3,600

560

December

3,800

580

24,000

3,600

You are required to segregate the maintenance cost which is semi-variable into fixed and variable elements by using Range method.