Considering the following project data in the table. Assuming that in the baseline schedule every activity stars at the early start time (critical path method). The actual progress and cost are recorded at the end of 15th week.

activity	Duration(week)	cost	completed	Actual cost	Immediate successors
1	4	10	100%	18	2,5
2	7	30	100%	26	3,4,7
3	2	36	100%	48	6
4	6	80	50%	60	6
5	3	46	100%	52	6
6	9	60	0%	0	8,10
7	3	20	10%	10	8,10
8	10	90	0%	0	9
9	9	72	0%	0
10	6	55	0%	0

1. Give the cumulative planned value of each week.
2. According to the actual progress and cost data, calculate the SV, SPI, CV, CPI , and explain the meaning of these indicators.
3. According to the actual progress data, calculate the ES, SV(t), SPI(t), and explain the meaning of these indicators.