Final answer:
To find the sale price of an iPhone with a 20% discount, calculate 20% of the original price and subtract it from the original price. For an original price of $345.00, the discount is $69.00, making the sale price $276.00.
Step-by-step explanation:
If iPhones originally cost $345.00 and were on sale for 20% off during Labor Day weekend, we need to calculate the discount and subtract it from the original price to determine the sale price. First, we find what 20% of $345.00 is:
20% of $345.00 = 0.20 × $345.00 = $69.00
Next, we subtract this discount from the original price:
$345.00 - $69.00 = $276.00
So, you would pay $276.00 for an iPhone during the Labor Day weekend sale.