how to calculate mortgage in javascript

Question

I have formula for finding monthly payment with four fields

1. Loan Amount
2. Interest Rate
3. Terms of loan
4. Monthly Payment

Answer 1

var deno = (100 + Interest_rate_per_annum)/100;
var pdeno = Math.pow(deno, Term_of_Loan);
var loan_amount = (Monthly_payment * Term_of_Loan * 12) / pdeno;