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| /** | |
| * Copy of Excel's PMT function. | |
| * Credit: http://stackoverflow.com/questions/2094967/excel-pmt-function-in-js | |
| * | |
| * @param rate_per_period The interest rate for the loan. | |
| * @param number_of_payments The total number of payments for the loan in months. | |
| * @param present_value The present value, or the total amount that a series of future payments is worth now; | |
| * Also known as the principal. | |
| * @param future_value The future value, or a cash balance you want to attain after the last payment is made. | |
| * If fv is omitted, it is assumed to be 0 (zero), that is, the future value of a loan is 0. |