After the release of radioactive material into the atmosphere from a nuclear power plant in a country in 1982​, the hay in that country was contaminated by a radioactive isotope​ (half-life 5 ​days). If it is safe to feed the hay to cows when 12​% of the radioactive isotope​ remains, how long did the farmers need to wait to use this​ hay? Question content area bottom Part 1 The farmers needed to wait approximately enter your response here days for it to be safe to feed the hay to the cows. ​(Round to one decimal place as​ needed.)