Suppose the value of x varies from x=a to x=. There are at least two ways of thinking about what percent x changed by. We'll explore two of them here. For each of the following questions, write an expression in terms of a and b to answer the question.

iii. Hence, if x varies from x=ato x=b, x changes by what percent?

iii. Hence, if x varies from x=ato x=b, what is the percent change in x?