In the absence of immunization, a certain disease is contracted at an average age a. If b percent of the population is immunized at birth, then the average age at which the disease is contracted is given by A = 99a 100-b We think of a as a constant, so A is a function of b. Find the vertical asymptote for A. (Express numbers in exact form. Use symbolic notation and fractions where needed. Give your answer in terms of b.) vertical asymptote: Leontreating the disease?