Final answer:
To find the percentage, set up a proportion and solve for the unknown percentage. The percentage is 60%.
Step-by-step explanation:
To find the percentage, we need to set up a proportion. Let's represent the unknown percentage as 'x'. The equation would be x% of $30 equals $18:
x/100 * $30 = $18
To solve for x, we can divide both sides of the equation by $30:
x/100 = $18/$30
x/100 = 0.6
To isolate x, we multiply both sides of the equation by 100:
x = 0.6 * 100
x = 60
Therefore, the percentage is 60%.
Learn more about finding percentages