Answer:
9% of tickets were sold in advance for the dance
Explanation:
In order to find the percent of the tickets purchased in advance, you have to divide the number of tickets already purchased by the total number of tickets.
18 / 200 = 0.09
Now, you will multiply this number by 100 to get the percentage.
0.09 * 100 = 9
9% of the tickets that were purchased in advance are able to purchase.