double note_payment = calc_payment(note_total, note_term, note_amortization);


public Double calc_payment(double present_value, double payments, double interest) throws Exception {
	interest = interest / 12;
	double power =  Math.pow(( 1 + interest ),payments);
	double payment = 0.00;
	payment = (interest * (present_value * power) / (power - 1)) ;
	return payment; 		
}