12.5% less than 400kg is () kg, 12.5% more than 400kg is () kg, 30 less than 40 is () kg

5% less than 400kg is (350) kg, 12.5% more than 400kg is (450) kg, and 30% less than 40 is (25)%
400 * (1-12.5%) = 350
400 * (1+12.5%) = 450
10/40 = 25%

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