t1/2 = 1/k[A]0
50 = 1/k*0.84
k = 1/42
1/[A] = 1/[A]0 + kt
1/4 of concentration is: 0.84/4 = 0.21
1/0.21 = 1/0.84 + 1/42*t
3/0.84 = 1/42*t
t = 150 s
Answer: e. 150 sec
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