Kara has a credit card that uses the Unpaid Balance Method. The card has an annual interest rate of 21%. At the end of August, her unpaid balance was $100. In September, she made the following purchases and payments: Sept 1: Purchased $120 in groceries Sept 8: Made a payment of $20 Sept 20: Purchased shoes for $62 Find the unpaid balance at the end of September (hint: don't forget to add interest from August)