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- <html>
- <head>
- <script type="text/javascript">
- function checkForZero (field) {
- if (field.value == 0 || field.value.length == 0)
- { alert ("NO ZERO'S!!!");
- field.focus(); }
- else
- calculatePayment (field.form);
- }
- function show_prompt ()
- {
- var interestRate=prompt ("Enter interest Rate (%)");
- var lengthLoan=prompt ("Enter length of the loan (Years)");
- var loanAmount=prompt ("Enter amount of loan($)");
- var n = interestRate/12*lengthLoan;
- var m1 = loanAmount * math.pow ((1+interestRate) , n);
- var m2 = m1 * interestRate;
- var m3 = math.pow((1+interestRate) , n)-1;
- var m = m2 / m3;
- var mortgage=prompt (m);
- }
- </script>
- </head>
- <body>
- <input type="button" onclick="show_prompt()" value="Calculate" />
- </body>
- </html>
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