OSHA is considering a revision of the Permissible Exposure Limit (PEL) for pentane, which is currently set at 1000ppm TWA. The additional industry costs for compliance with the new lower exposure limit are expected to be $490 million, while OSHA is expected to spend another $150 million towards enforcement costs. Assuming that the new limit will prevent 8,500 cases of asthma, valued at $24,000 each, and 80 fatal cancers valued at $10 million each. what is the benefit-cost ratio of this proposed regulatory revision? 2.05 1.57 1.25 0.32 0.67