<!doctype html> <html> <head> <title>Simple Interest Calculator</title> <script> function calculate() { var amt,rate,time,si; amt=parseFloat(document.frm1.t1.value); rate=parseFloat(document.frm1.t2.value); time=parseFloat(document.frm1.t3.value); si=(amt*rate*time)/100; document.frm1.t4.value=si; } </script> </head> <body> <h1 align="center">Mark-sheet Calculator using JavaScript</h1> <form name="frm1"> <table border="1" cellpadding="5px" cellspacing="0" width="60%" align="center"> <tr> <td>Amount</td> <td><input type="number" min="0" name="t1"/></td> </tr> <tr> <td>Rate</td> <td><input type="number" min="0" name="t2"/> </td> </tr> <tr> <td>Time</td> <td><input type="number" min="0" name="t3"/></td> </tr> <tr> <td>Simple Interest</td> <td><input type="number" min="0" name="t4"/> </td> </tr> <tr> <td></td> <td><input type="button" value="Calculate" onclick="calculate()"/></td> </tr> </table> </form> </body> </html>