9601 = 8000e ^ (.16t)
9601/8000 = e^(.16t)
1.2 = e^(.16t)
x = 1.2, b = e = 2.71828183, n = (.16t)
we know that b^n = x is the same as logb x = n
ln 1.2 = .16t
t = ln1.2/.16
t = .1823215568/.16
t = 1.13950973 you round to the place your teacher suggests