PLZZZZZZZZZZ help!!!!!!!

ok so i'm flying to minneapolis tomorrow morning (i'm 14) and i'm going to meet up with my auntie in minneapolis and were going to go to the mall of america. She said that she would pay for the hotel and all the food and she said i could bring my own shopping money. we will be there for 3 days, how much money should i bring?!?!?! i have noooooo clue how much to bring