1. **State the problem:** Tyrone found surfboards on sale for 594 that had previously cost 675. We need to find the percentage discount. 2. **Formula for percentage discount:** $$\text{Percentage Discount} = \frac{\text{Original Price} - \text{Sale Price}}{\text{Original Price}} \times 100\%$$ 3. **Calculate the discount amount:** $$675 - 594 = 81$$ 4. **Substitute values into the formula:** $$\frac{81}{675} \times 100\%$$ 5. **Simplify the fraction:** $$\frac{\cancel{81}}{\cancel{675}} = \frac{81 \div 27}{675 \div 27} = \frac{3}{25}$$ 6. **Calculate the percentage:** $$\frac{3}{25} \times 100\% = 12\%$$ **Final answer:** The discount is 12%.