Answer
$n=12$
Work Step by Step
$a_n=\frac{2n}{n+8}$ when $a_n=1.2$
$\frac{2n}{n+8}=1.2$
$\implies 2n=1.2(n+8)$
$\implies 2n=1.2n+9.6$
$\implies 0.8n=9.6$
$\implies n=12$
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