Answer
$3\ A$
Work Step by Step
Since the current and resistance vary inversely in a circuit with a given voltage, then for a given voltage, we have
(resistance)( amperes)=(resistance)( amperes).
Now, we have
$$
30\times 8=80\times x\Longrightarrow x=\frac{30\times 8 }{ 80}=3\ A
.$$
