Explanation:
if the text is correct, I see
0.16 × 0.7 / 0.4
that is the same as
16/100 × 7/10 / 4/10 = 16/100 × 70/100 / 40/100 =
= 16/100 × 70/100 × 100/40 =
= 16/100 × 70/40 = 16/100 × 7/4 =
= 4/100 × 7 = 28/100 = 0.28
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