You may have noticed that a relatively small percentage of people do the vast majority of postings on social networks. The rational function defined by

models this participation inequality. In this formula, f(x) outputs the percentage of the postings done by the least active (bottom) x percent of the population. 

(a) Evaluate f(98). Interpret your answer. 

(b) Evaluate f(100)-f(98). Interpret your answer.

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f(x)= 100 101 - x' 5≤ x ≤ 100,