How can i pay my parents back?

There's lots of money in mowing lawns and detailing cars. There's still at least another month to two months, depending on where you live, that gr will be growing like crazy. Cars always need washing, especially suvs and minivans which have melted chocolate, pretzels, and melted crayons in the interior. This is something you can do after school and/or on weekends. The tips can be good, as well. Small suburban lawns around here avg $20-$30 per lawn (Houston area). I think you have a pretty good shot at paying them back. You stand an excellent chance at being successful in life - you already know what it is to work for something you really want. Enjoy your macbook!