So my sister has this money sitting pretty in her bank account, and she has no time or business to use it for at the moment.
So while we were talking a few days ago, I suggested fixing the funds. She became interested and I offered to help her find out the interest rate of first bank.

So we'd really appreciate it if anyone who knows can gives us a clue on the prevailing interest rates of commercial banks.

Bad idea.! With the high rate of inflation in this country, saving in naira may not be a good idea. Why not buy commodities you can resell later?

Or just convert to $$$ and keep

Buy usdt and do tenure investments with it.