Yo Yatra Co. makes packages for its customers and provide you the number of packages
and costs associated with the packages booked all over the world.
Month	# of packages	Total Cost
	booked
1	300	$ 10,000
2	220	$ 8,000
3	250	$ 8,400
4	260	$ 8,800
5	350	$ 12,000
6	400	$ 12,400
7	350	$ 12,100
8	400	$ 12,500
9	500	$ 14,000
10	280	$ 7,500
11	120	$ 5,500
12	100	$ 4,200
Solve by Least-squares Regression Method and find out Variable cost per package,
the Fixed costs per month, and semi-variable costs per month associated with it.
DO NOT SOLVE BY HIGH-LOW METHOD AND REGRESSION COEFFICIENT FORMULA
THIS IS AN ACCOUNTING QUES, SO DO NOT POST IN STATISTICS