2, 2*0.2*4= 1.6 m2

3.0.2 * 0.2 * 2+ 1.6/2 = 0.88m2。

The second question1800 ÷ (1+1/8) =1600.

The third question (200- 15) is divided by 200 = 92.5%.

Answer over

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