Answer:40 metersStep-by-step explanation:To find the perimeter of the herbal garden, we can use the formula for the perimeter of a rectangle, which is:Perimeter = 2(length + width)Given:Length = 12 metersWidth = 8 metersSubstitute the values into the formula:Perimeter = 2(12 + 8)Perimeter = 2(20) Perimeter = 40 metersTherefore, the perimeter of the herbal garden is 40 meters.