What factors should be considered when determining the cost of advertising on a website, such as banner ads?

When determining the cost of advertising on a website, factors such as the website's traffic volume, audience demographics, ad placement, ad format, and duration of the ad campaign should be considered.

<?php
// Sample code to calculate the cost of advertising based on different factors
$trafficVolume = 10000; // Number of daily visitors to the website
$audienceDemographics = "young adults"; // Target audience demographics
$adPlacement = "homepage"; // Location of the ad on the website
$adFormat = "banner"; // Format of the ad
$duration = 30; // Duration of the ad campaign in days

// Calculate the cost based on the factors
$cost = ($trafficVolume * 0.001) + ($duration * 10);
echo "The cost of advertising on the website is $" . $cost;
?>