How much is in a sinking fund after 20 quarterly payments (end of each quarter) of $497.88 if interest is 3% compounded quarterly?

A project has an initial cost of $10,000. This project is expected to bring in $2,625 per year for 4 years. If money can earn 2% compounded annually, what is the net present value of this project? If your NPV is less than 0, enter a negative for your answer.

10 semi-annual payments of $945.44 are made towards a sinking fund that accumulates to $10,000. How much interest was gained on this sinking fund?