The peak overpressure expected as a result of the explosion of a tank in a plant facility is approximated by the equation: log P = 4.2 _ 1.8 log R where P is the overpressure in psi and R is the radial distance from the blast in feet. The plant employs 500 people who work in an area from 10 to 500 ft from the potential blast site. Estimate the number of fatalities expected as a result of lung hemorrhage and the number of eardrums ruptured as a result of this blast. Be sure to state any additional assumptions.