=+ 4.27. A bank frequently makes large installment loans to builders. At any point in time, outstanding loans are classified in the following four repayment categories: A: Current B: Up to 30 days delinquent C: 30-60 days delinquent D: Over 60 days delinquent The bank has established the internal standard that these loans are "in control" as long as the percentage in each category is as