Final answer:
To find the sale price of an item that is 20% off, multiply the original price (p) by 0.8. For instance, if the original price is $50, the sale price would be $50 × 0.8 = $40.
Step-by-step explanation:
To calculate the sale price of an item during a 20% off sale, you can use the formula p - 0.2p where p is the original price of the item. The equation simplifies to 0.8p, as you are subtracting 20% (or 0.2 times p) from the original price. Therefore, to find the sale price, you multiply the original price by 0.8.
For example, if the original price of an item is $50, the sale price would be calculated as follows:
- Calculate 20% of $50: 0.2 × $50 = $10
- Subtract this from the original price: $50 - $10 = $40
- Alternatively, multiply $50 by 0.8 directly: $50 × 0.8 = $40
So the sale price of the item would be $40.