10 pts. Making exponential functions?

Blindman

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The rate of change in sales S is inversely proportional to the time (t>1).
Find S as a function if sales after 2 and 4 weeks are 200 and 300 respectively.

So I got dS/dt=1/t and S=ln|ct|
I try to find the constant, but I'm not sure about it. Help? Thanks

Also, I do know that ln|ct| = ln|t| + ln|c| but when c is an arbitrary constant, ln|c| = c so yeah. More please.
 
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