What single percentage change is equivalent to a 17% decrease followed by a 9% increase?

Firstly it was X. After 17% decrease it was 0,83x. To increase 0.83x by 9%
0,83x*1.09=0,9047x=90,47% of x
The difference is 100%-90,47%=9,53%

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.