The problem is to convert the unit $3 cg$ to $hg$.

1. Problem Description

The problem is to convert the unit $3 cg$ to $hg$.

2. Solution Steps

We need to convert centigrams ($cg$) to hectograms ($hg$).

First, recall the relationships between these units and grams ($g$):

$1 cg = 0.01 g$

$1 hg = 100 g$

Now we can convert $3 cg$ to $g$:

$3 cg = 3 \times 0.01 g = 0.03 g$

Next we convert $0.03 g$ to $hg$. Since $1 hg = 100 g$, then $1 g = \frac{1}{100} hg = 0.01 hg$. Therefore,

$0.03 g = 0.03 \times 0.01 hg = 0.0003 hg$

3. Final Answer

$0.0003 hg$