Answer
$\frac{1}{2}\ ton.$
Work Step by Step
The lever priciple states that
$$F_1d_1=F_2d_2.$$
We plug in the given values to get:
$$
1\times 4=x\times 8\Longrightarrow x=\frac{1\times 4}{8}=0.5\ ton=\frac{1}{2}\ ton.$$
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