Radioactive isotopes used in cancer therapy have a "shelf-life", like pharmaceuticals used in chemotherapy. Just after it has been manufactured in a nuclear reactor, the activity of a sample of 60Co is 4.98 103 Ci. When its activity falls below 3500 Ci, it is considered too weak a source to use in treatment. You work in the radiology department of a large hospital. One of these 60Co sources in your inventory was manufactured on October 6, 2020. What will be the activity of the 60Co in the sample on April 6, 2023, 2.50 years after the sample was manufactured? The half-life of 60Co is 5.271 years