Show:
x5
x6 (__x5) + (__x1)
x7 (__x5) + (__x2)
x8 (__x4) + (__x4)
x9 (__x5) + (__x4)
100

2x5

10

100

6x2

12

100

7x1

7

100

8x2

16

100

9x2

18

200

4x5

20

200

6x3

18

200

7x3

21

200

8x4

32

200

9x4

36

300

5x5

25

300

6x6

36

300

4x7

28

300

8x6

48

300

9x6

54

400

7x5

35

400

6x8

48

400

7x6

42

400

8x7

56

400

9x8

72

500

9x5

45

500

6x9

54

500

7x8

56

500

8x8

64

500

9x9

81