Payment

This depends on whether it is simple interest or compound (reducing) interest.
A big loan over a long period of time would usually be reducing interest which is cheaper.
Either way, 2.5% per month is 30% per year so it is going to be a lot of money.

Simple interest works out at $3666.67 per month Reducable interest works out at$3035.64 per month.

If you want me to double check my answers or explain how I got them just ask me.