At a party, there are 50 people. 30% of them are boys. How many girls are at this party? Give me reasons, before answering the question

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
There are 50 * 30 / 100 = 15 boys at that party. That means there are 50 - 15 = 35 girls. So the final answer is 35.