1. **State the problem:** We need to find what percentage of the total school population entered for the Basic Certificate Education Examination. 2. **Identify the given values:** - Total pupils in school = 1140 - Pupils entered for examination = 228 3. **Formula for percentage:** $$\text{Percentage} = \left(\frac{\text{Part}}{\text{Whole}}\right) \times 100$$ 4. **Apply the formula:** $$\text{Percentage} = \left(\frac{228}{1140}\right) \times 100$$ 5. **Calculate the fraction:** $$\frac{228}{1140} = 0.2$$ 6. **Multiply by 100 to get percentage:** $$0.2 \times 100 = 20$$ 7. **Interpretation:** 20% of the school population entered for the examination. **Final answer:** 20%