First, find the decrease of price
decrease = 65 - 50
decrease = 15
The price decreased by $15
Second, find the percentage of $15 to $65
percent = decrease/original × original percent
percent = 15/65 × 100%
percent = 1,500/65 %
percent = 23.08%
percent = 23%
The percent of decrease in the price of prom tickets is near 23%