exam Maths Puzzle Numerical Ability

10 + 10y2=x

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Hi, I have to solve the following for t:

300=500(1-e^0.2t)
Assume that ln *0.4)= -0.9

I wouldnt even know where to start..all i can think to do is
300500=(1-e^0.2t)

any help would be very much appreciated! thanks i have to find the equivalent to this expression.
4(12m/3)+9-2(3m)
choices are as follows:
A: 16m+9
B: 31m
C: 10m+9
D: 19m
This problem has confused me. Thanks!!!