jquery - change raido button selection on input

what i want to do is - if amount more than 5000 , check radio button curr : value LBP else check usd - if fees are inserted , in radio button amount_type : check Receive else check send , can you assist please

by mufazmi

HTML

<script src="https://code.jquery.com/jquery-1.12.4.min.js"></script>
Amount<input type='text' name='amount' size='10' id='amount'  >
      <br>      
    Free<input type='text' name='fees' size='10' id="fees" > 
     <br> 
     ------------
     <br>
    <input type='radio' id='receive' name='amount_type' value='Receive'checked> Receive<br>
    <input type='radio' id='send' name='amount_type' value='Send'> Send<br>
    -------------
     <br>
            
    <input type='radio' id='lbp' name='curr' value='LBP'checked> LBP<br>
    <input type='radio' id='usd' name='curr' value='USD'> USD<br>

JavaScript

$(document).ready(function(){
    $("#usd").prop("checked", true);
    $("#send").prop("checked", true);
    $("#amount").on("input", function(){
        // Print entered value in a div box
        if($("#amount").val() > 5000){
            $("#lbp").prop("checked", true);
        }else{
            $("#usd").prop("checked", true);
        }
    });
    $("#fees").on("input", function(){
        // Print entered value in a div box
        if($("#fees").val() > 0){
            $("#receive").prop("checked", true);
        }else{
            $("#send").prop("checked", true);
        }
    });
});