AI in Advertising and Marketing Practice Test 2026 – Comprehensive Exam Prep

The key idea here is how we measure what a piece of advertising returns compared with what it costs, and how that looks when we’re focusing on the extra lift an ad campaign creates.

For ROI, the standard approach is to compare profit to cost, so ROI is (revenue minus cost) divided by cost. This shows how much profit the advertising investment generates relative to what was spent, rather than just looking at total revenue.

Incremental ROAS is about the uplift specifically driven by the advertising effort. It takes the additional revenue attributed to the ads (the lift beyond baseline) and divides it by the ad spend used to achieve that lift. This tells you how much revenue each dollar of ad spend is producing beyond what would have occurred without the ads.

The best answer combines both of these correct ideas: ROI uses (revenue minus cost) over cost, and Incremental ROAS uses additional revenue attributed to advertising divided by ad spend. The other options miss one or both parts—one uses revenue over cost (not the standard ROI), another uses a misleading formula for ROI, and another only defines Incremental ROAS without tying it to ROI.