Tritium, (3/1) H, decays by beta decay with a half-life of 12.3 years. How long will it take for a sample
of tritium to decay to 1.5% of its original value?
(A) 24.6 years
(B) 49.2 years
(C) 36.9 years
(D) 12.3 years

Answer is C, but I keep getting the wrong answer (I’m getting 73.8 years which isn’t even an option).