The Pomegranate Board, a trade group, divides potential buyers into $4$ key segments. "Central City Actives" are young adults who work hard to maintain a healthy lifestyle$--$a key group for the industry. The Pomegranate Board believes that this group includes $39\mathrm{.}0$ million potential customers, and accounts for $$51\mathrm{.}6$ million in industry sales. Overall, The Pomegranate Board reports total industry sales of $$188\mathrm{.}5$ million, in a marketplace with a total of $160\mathrm{.}9$ million potential customers. Calculate category development index for the "Central City Actives" segment, for the pomegranate industry. Report your answer as a percent, and round your answer to the nearest tenth of a percent. Report $27\mathrm{.}5\%,$ for example, as $"27\mathrm{.}5".$