Armando has a credit card that uses the adjusted balance method. for the first 10 days of one of his 30-day billing cycles, his balance was $2500. he then made a payment of $1600, so his balance decreased to $900, and it remained that amount for the next 10 days. armando then made a purchase for $1300, so his balance for the last 10 days of the billing cycle was $2200. if his credit card's apr is 33%, how much was armando charged in interest for the billing cycle?