1. **State the problem:** Calculate the percentage of the pizza that is cheese. 2. **Formula:** Percentage of a part = $\frac{\text{part}}{\text{whole}} \times 100$% 3. **Apply the formula:** Cheese weight = 210 g, Total pizza weight = 750 g $$\text{Percentage of cheese} = \frac{210}{750} \times 100$$ 4. **Simplify the fraction:** $$\frac{210}{750} = \frac{\cancel{210}}{\cancel{750}} = \frac{7}{25}$$ 5. **Calculate the percentage:** $$\frac{7}{25} \times 100 = 7 \times 4 = 28$$ 6. **Answer:** Cheese makes up 28% of the pizza.