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**I've been trying to answer the following equation but I just can't get my head around it!**

'calculate the time taken 't' for the voltage over capacitor array (Vc) to reach 80% of Vo, in terms of Vo, R, C1 and C2 (caps are in parallel)'

'calculate the time taken 't' for the voltage over capacitor array (Vc) to reach 80% of Vo, in terms of Vo, R, C1 and C2 (caps are in parallel)'

**I know I need these two equations but I just don't know what to do with them:**

Vc = Vo (1 - e^[-(t/tau)])

tau = R.C

Vc = Vo (1 - e^[-(t/tau)])

tau = R.C

**I have tried solving it but I just doesn't make sense and there isn't an RC circuit calculator that I can check my answer with :(, anyways help would be fantastic, thanks**