To find the area of the coffee shop, we can use the formula for the area of a rectangle, which is:
\[ \text{Area} = \text{length} \times \text{width} \]
For the coffee shop, the dimensions are 5 cm by 6 cm:
\[ \text{Area of the coffee shop} = 5 , \text{cm} \times 6 , \text{cm} = 30 , \text{square cm} \]
So, the area of the coffee shop is 30 square cm.
Next, to find what percent of the shopping plaza is the coffee shop, we use the formula:
\[ \text{Percentage} = \left(\frac{\text{Area of the coffee shop}}{\text{Area of the entire shopping plaza}}\right) \times 100% \]
Now we can plug in the values we have:
\[ \text{Percentage} = \left(\frac{30 , \text{square cm}}{300 , \text{square cm}}\right) \times 100% \]
\[ \text{Percentage} = \left(0.1\right) \times 100% = 10% \]
Thus, 10% of the shopping plaza is the coffee shop.