Based on the given data, Ali would maximize his profit by setting the selling price at $10.00, as it generates the highest total revenue.
At a price of $5.00, he can sell 20 units, resulting in a total revenue of $100.00 ($5.00 x 20).
At a price of $10.00, he can sell 15 units, resulting in a total revenue of $150.00 ($10.00 x 15).
At a price of $20.00, he can sell 5 units, resulting in a total revenue of $100.00 ($20.00 x 5).
Comparing these scenarios:
$5.00 price: Total revenue of $100.00
$10.00 price: Total revenue of $150.00
$20.00 price: Total revenue of $100.00
Therefore, based on the given data, Ali would maximize his profit by setting the selling price at $10.00, as it generates the highest total revenue.