The radioactive substance Iridium-192 has a half-life of 73.83 days. How many days would it take for a sample of Iridium-192 to decay to 10% of its original amount? Round your answer to the nearest integer.
1/2 = e-k(73.83)
k=.009388422
.1 = e-.009388422 t
t= ~ 245 days
+1072 
