In 1986, one of the largest nuclear power plants in the Ukraine suffered a horrible explosion that sent radioactive iodine and cesium into the air. A large amount of radiation escaped into the atmosphere, and much is still contained in the soil. The half-life of cesium-137 is about 30.2 years. If a soil sample was found to contain 18.4 mg of cesium-137 in 2005, how much was released into the soil at the time of the accident? How much is cesium-137 will be left in 2030?