A store is having an inventory reduction sale, so an employee marks down some mountain bikes from $436 to $419. What is the discount percentage?

Round your answer to the nearest percent and include a percent sign (%).

The discount is the difference between the original price and the sale price: $436 - $419 = $<<436-419=17>>17

To find the discount percentage, divide the discount by the original price: 17 / 436 ≈ 0.0391
Multiply the result by 100 to convert it to a percentage: 0.0391 * 100 ≈ 3.91%
Rounded to the nearest percent, the discount percentage is 4%. Answer: \boxed{4\%}.