Find a part time job like delivering pizzas or go out door to door and ask neighbors if they want their lawn cut and put that money back in your savings. If your parents know you're making cash on the side don't tell them all the money you have made so slowly you can put that money you spent back into your savings to get your 240 back.
If you do a lawn job and make 20 dollars say you made ten and put ten back into savings. Theres a lot of jobs you can find paying cash i found lawn care like mowing lawns or asking in your neighborhood if they need their hedges trimmed. Etc etc...
