Chapter 6, Section 6.5, Question 003d John has a balance of $3500 on his credit card that charges 2% per month on any unpaid balance. John can afford to pay $100 toward the balance each month. His balance each month after making a $100 payment is given by the recursively defined sequence Bo = $3500, Bn = 1.028n-1 - 100 After the balance has been paid off, what was John's interest expense? John's interest expense was $ the absolute tolerance is +/-0.5