In September, there were 16 members in the music club. In October, the number of members was 24. What was the percent increase from September to October?20 out of 22 students passed the quiz. What percentage of students passed the quiz?A real estate agent sold a house for $178,000. He makes 5.5% commission. How much did he make?The original price of a shirt is $23. It is 20% off. What is the sale price?