To find the unit rate of plates per stack, you can divide the total number of plates by the number of stacks.
Given:
- Total plates = 32
- Total stacks = 8
Calculation: \[ \text{Plates per stack} = \frac{\text{Total plates}}{\text{Total stacks}} = \frac{32}{8} = 4 \]
Therefore, the unit rate is 4 plates per stack.