The attendance at a seminar in one year was 500 in your to the attendence changed by 100 what was the percent change in attendance

500-100= 400

400/500= 0.8

(0.8) 100= 80% ( I think, I'm not sure )     if not is 40%

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.