like how did he got total dircetion 450 and time

and how he got 24 time and 470 total direct cost can you please show me how he got all of the number in the table

Cost-Duration Trade-off Direct costs Activity D Maximum ch Normal Crash B 6 Time 23 Sepe E 8 WE Total direct cost $ 405 Time 3:20 G 1 2 2 4 2x 10 5 10 11 als | | | 9 Cost $50 80 00 50 100 40 70 Cost $70 100 90 150 160 70 70 D OOOO Activities changed 7 D 10 2 6 4 526 5 O 6 6 (A) Total direct con 3450 B . Time 22 Legend ACT DUR Total direct cost $ 525 8 Time A 2x 10 0 6 10 F D 10 D 11 in direct cost $ 450 RE Activities changed $50 4x (B) (A) Total direct cost 5.670 UN Time 24 Total direct cost $ 610 Time 21 8 6 G 10 o 0 2x G 6 9x F 5 Activities changed 11 D 9 Activities changed $90 526 $50 $30 $ 4X (B) (C)