Question 1129572
32/250=0.128
A=Ao*2(-t/h)
32=250*2(-t/h)
0.128=2*(-250/h)
ln(0.128)=-250/h * ln2
divide both sides by ln2 and multiply by h
-2.9658h=-250
h=84.29 min or 84 min

0.128 is almost decayed 3 half lives, and 3 half lives would be 252 minutes, which is reasonable.