The regular price of the item is $30, and it is on sale for 20% off. To find the sale price, we can calculate 20% of $30 and then subtract that amount from the original price.

1. Calculate 20% of $30:

   $20\% \times 30 = 0.2 \times 30 = 6$

2. Subtract the discount from the original price:

   $30 - 6 = 24$

Answer: The sale price is $24.

Would you like a detailed breakdown or have any questions about this?

Here are five related questions you might find interesting:

1. What would the sale price be if the discount were 25% instead of 20%?
2. How much would the item cost if the discount were only 10%?
3. If an additional 5% discount is applied on the sale price of $24, what would be the new price?
4. How do we calculate the final price if both state and federal taxes apply after the discount?
5. How does percentage discounting work in a tiered discount system?

Tip: To calculate a discount quickly, multiply the original price by the decimal form of the discount percentage, then subtract from the original price.