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7. (D) 0,7.

400 – 120 = 280

280 / 400 =

28 / 40 =

14 / 20 =

7 / 10 =

0.7.

8. (C) 0,165.

98 / 600 =

100 / 600 – 2 / 600 =

1/6 – 1/300 =

~0,165.