
To compute the payment amount, fill in lines 1, 2, and 3; Compute.
To compute an interest rate, fill in lines 1, 3, and 6; Compute Interest Rate then Compute.
To compute a principal, fill in lines 2, 3, and 6; then Compute Principal. Fills in mean, alerts for range.
To compute the duration of a loan, fill in lines 1, 2, and 6; then Calc Time. Alert box only.
Repayment months may be > 11. If so it will be converted to years and months, i.e. 21 will be 1 yr 9 mo.
You can specify a monthly amount in line 5 and then press the TAB key. 