Sorry - another question.

For the following, I got $97,800 as an answer. Is this correct? It doesn't seem to make sense. I know I'm doing something wrong here, but what could it be?

Tula repays her father $4890 to cover a debt for a motorbike which she incurred 15 months ago, agreeing to pay 4% p.a. How much did she borrow?

Many thanks.