After 3 days a sample of radon-222 decayed to 58% of its original amount.
How long would it take the sample to decay to 25% of its original amount?

A. t = 11.45 days
B. t = 32.53 days
C. t = 2.54 days
D. t = 7.63 days
E. t = 5.09 days
F. none of those