Final answer:
Amari sold the used sneakers for $99 after buying them for $110 and selling them at a 10% discount.
Step-by-step explanation:
Amari bought sneakers for $110 and sold them for 10% less after a month. To calculate the selling price, we first find 10% of the original price. Ten percent of $110 is calculated by multiplying $110 by 0.10, which equals $11. Subtracting this from the original price gives us the selling price.
$110 - $11 = $99
Therefore, Amari sold the used sneakers for $99.