Inactive Tutor answered 09/27/15
Tutor
New to Wyzant
If you have a TI - 83 plus or a TI - 84 plus, there is a key sequence using the 'APPS' button that will let you put in the particulars and do an amortization problem for you.
Without the calculator program, there are formulae in the text or on-line. I am not handy enough with the syntax of this medium to express the formulae for you in this reply.