Honestly, it took my 45 whole minutes to figure this out and A lot of steps, so just trust me on this one and if you want an expantation I will put one in for you, k? :)
The percentage of the tickets for the dance that were purchased in advance is 9%.
Percentage is the fraction of an amount that is expressed as a number out of hundred. The sign used to represent percentage is %.
Percent of advance tickets bought = (number of advance tickets / total number of tickets) x 100
(18 / 200) x 100 = 9%
To learn more about percentages, please check: brainly.com/question/25764815