If you are not already in the market and do not fully understand the ins and outs of trading as well as the fees, PLEASE do not do it.
Why is is just 30 days? Your time frame is not good for the market, CD's etc.
A lot of people get into Day Trading and if you are not 100% spot on with your knowledge of the market, fees and if you blink your eye... you lose everything. VERY risky. Don't risk any money you can't afford to just throw out the window.
If this a JFF question? If you have the money for 30 days only, talk to your investment counselor for guidance and if you don't have one, talk to your banker. I do strongly suggest you get an investment counselor you trust. Are you expected to give the $2500 back and you are hoping to keep any profits? I don't understand the time limit or the amount of money.
$2500 is not much money when it comes to making an investment, especially in the market when you calculate all the fees of the in/out trading.
Good luck.