A sales manager wants to see the relationship between employee work experience and sales. 

The following is the data of PT CARSI employees in 2019.

Employee	Work Experience (years)	Car Sales (unit)
1	1	80
2	3	97
3	4	92
4	4	102
5	6	103
6	8	111
7	10	119
8	10	123
9	11	117
10	13	136

Question:
a. Determine a simple linear regression equation that can be used to predict car sales based on work experience. (Weight 25)
b. Calculate the SST, SSR and SSE values (Weight 25)
c. Calculate the coefficient of determination r2 (Weight 25)
d. Make a scatter diagram of the car sales data (Weight 25)