To find the unit rate of beads per bracelet, you divide the total number of beads by the number of friends (or bracelets).
Given:
- Total beads = 156
- Number of friends = 12
Calculate the unit rate:
\[ \text{Unit rate} = \frac{\text{Total beads}}{\text{Number of friends}} = \frac{156}{12} = 13 \]
So, the unit rate of beads per bracelet is 13 beads.