Step 1 :To find the sale price, calculate 40% of the original price, which is $9.
Step 2 :Calculate the sale price using the formula: \( \text{sale\_price} = \text{original\_price} \times \frac{\text{sale\_percentage}}{100} \)
Step 3 :Substitute the given values: \( \text{sale\_price} = 9 \times \frac{40}{100} \)
Step 4 :Simplify the calculation: \( \text{sale\_price} = 9 \times 0.4 \)
Step 5 :Calculate the final sale price: \( \text{sale\_price} = 3.6 \)
Step 6 :Final Answer: \( \boxed{3.6} \)