The amortization table for a $300,000 loan had a sum cell added to the bottom of the monthly payment, toward interest, and toward principal columns that yielded the following totals at the end of the first year of payments. Payments for 12 months: $26,592.72 Interest for 12 months: $11,669.74 Principal for 12 months: $14,922.97 At the end of the 12-month period, what percent of the principal has been paid off