Question

这就是我要编写JavaScript的目的。为了解决这些年，需要花费“ X”美元来退休。从逻辑上讲，这可以通过财务计算器或反复试验的未来价值方程来解决。有没有更清洁的方法来解决这个问题？

    html>
    <head>
     <title></title>


   </head>


    <script>
     function calculate()
    {
            ra = document.getElementById("ra").value;   // amount needed 
  to retire
            p = document.getElementById("n").value;     // initial 
  investment
            t = document.getElementById("t").value;     // annual 
   contribution
            r = document.getElementById("rate").value; // radio button 
   interest rate



        }

    </script>


    <body>
    <h1>You probably want to retire someday so let's get started</h1>                    
   <br>
    <div> <label> How much money do you need to retire </label> <input 
    id="ra"> </div>      <br>
    <div> <label>Initial Investment </label> <input id="p"> </div>                       
    <br>
    <div> <label>Annual Contribution: </label> <input id="ac"> </div>                    
     <br>

    Expected Interest Rate: Select from the following please: <br>
    <input type="radio" name="rate" value="1">   1  <br>
    <input type="radio" name="rate" value="1.5"> 1.5<br>
    <input type="radio" name="rate" value="2">   2  <br>
    <input type="radio" name="rate" value="2.5"> 2.5<br>
    <input type="radio" name="rate" value="3">   3  <br>
    <input type="radio" name="rate" value="3.5"> 3.5<br>    
    <input type="radio" name="rate" value="4">   4  <br>
    <input type="radio" name="rate" value="4.5"> 4.5<br>
    <input type="radio" name="rate" value="5">   5  <br>  
    <input type="radio" name="rate" value="5.5"> 5.5<br>
    <input type="radio" name="rate" value="6">   6  <br>
    <input type="radio" name="rate" value="6.5"> 6.5<br>




     <button onclick="calculate()">Calculate</button>   
    <input type="button" value="Refresh Page" 
    onClick="window.location.reload()">

     <p id="result"> </p>
     display how many years it would take here
    </body>


    </html>

Answer 1

由于此情况将应用复利，

Time (t) = ln(A/P) / r
where, A = final Amount
P = Principal
r = Interest Rate(R)/100

针对您的情况-

document.getElementById("result).value = Math.log(ra/p)*100/r

为了退休需要节省多少x金额，未来价值复合计算

1 个答案: