Summer feels like an adult with three credit cards even though she is 22 years old. They were too easy to use, and she has charged the maximum on each one. They all have different interest rates. Card V has a balance of $3500 and charges 16%, card C has a balance of $1000 and charges 21%, and card M has a balance of $5000 but only charges 9%. What is Summer's total credit card debt?