finding resistane and currnent non-ohmic

1. The problem statement, all variables and given/known data
A 10.0-μF capacitor is charged by a 10.0-V battery through a resistance R. The capacitor reaches a potential difference of 4.00 V at the instant 3.00 seconds after charging begins
1.) Find R
2.) Find the current at t=3.00 seconds after charging begins.

2. Relevant equations

3. The attempt at a solution
so obviously I know how to find current but I need to find resistance and I cannot use R=V/I because it is non-ohmic! what do I do?

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