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Base payment = P × r ÷ (1 − (1 + r)^−n). Total monthly payment = base payment + extra payment. Balance is reduced month by month until paid off.- Apply the formulaBase payment = P × r ÷ (1 − (1 + r)^−n). Total monthly payment = base payment + extra payment. Balance is reduced month by month until paid off.347.28 per monthBase payment 347.28. Estimated payoff 120 months; total interest 9,674.09.