You make one charge to a new credit card, but then charge nothing else and make the minimum payment each month. You can't find all of your statements, the accompanying table shows, for those that you do have, your balance B, in dollars, after you made n payments. 2 4 7 Payment Balance B 478.73 440.74 389.33 329.99 a. Use regression to find an exponential model for the data in the table. (Round the decay factor to four decimal places.) b. What is the initial charge? c. For such a payment scheme, the decay factor equals Here r is the monthly finance charge as a decimal, and m is the minimum payment as a percentage of the new balance when expressed as a decimal. Assume that your minimum payment is 5%, so. Use the decay factor in your model to determine your monthly finance charge