Interest Rate is completely broken in the new update.
[number NaN] % is what the interest rate shows up as and if you wait the week, all the money you have in your bank becomes that. Which within the games measurements is basically zero.
I also literally do not know how to raise my corruption, a couple of the events seem tied to your corruption but there doesn't seem to be a way to raise it so I can't progress in any story that I've tried.