You have a test group, whereby rats have been exposed to increasing concentration of a toxicant via ingestion for toxicant WAS and FD and inhalation of toxicant PHM. The following graph was plotted. Please use this graph to answer the following questions. At what point did all the rats die from toxicant WAS, FD and PHM? Dose-Response Relationship for Toxin WAS, FD and PHM 100% 90% 80% 70% 60%% Response 40%% 30% 20% 10% 0% 10 mg 20 mg 25 mg 30 mg Toxin WAS Toxin FD -Toxin PHM Dose of Toxin