Two hundred volunteers participated in a cohort study. Of them 50% were not exposed. Thirty percent of the exposed participants and of the non-exposed participants developed an outcome. Based on the study, create 2 by 2 table. What is the incidence in the exposed group? Incidence in the exposed group =a/(a+b). a. 0.3 b. 0.12 c. 2.5 d. 3.14