You just sold a car to your nephew, and he has promised to make the following payments to you: $1,000 at the end of Year 1, $2,000 at the end of Year 2, $2,000 at the end of Year 3, and $3,000 at the end of Year 4. If the going rate of interest to purchase used cars is 7.5%, what is the effective price you are charging your nephew for the car?