Answer:
$3.78
Explanation:
To find the new price of the speaker after the sale, you can use the following formula:
New price = (1 + discount percentage) * (original price - discount amount)
In this case, the discount percentage is 40%, or 0.4, and the discount amount is 40% of the original price, or 0.4 * $4.50 = $1.80. Plugging these values into the formula, we get:
New price = (1 + 0.4) * ($4.50 - $1.80)
= 1.4 * $2.70
= $3.78
So the new price of the speaker after the sale and the subsequent price increase is $3.78.