A store that buys and sells used video games buys a game at a cost of ​$9 and sells it at a selling price of ​$12. Find the markup. Then find the percent markup.

The markup is calculated by subtracting the cost from the selling price: $12 - $9 = $3.

To find the percent markup, divide the markup by the cost and multiply by 100: ($3 / $9) * 100 ≈ 33.33%.

Therefore, the percent markup is approximately 33.33%.