JSFiddle - React, Tailwind, and code Playground

HTML

<input type="range" name="foo" id="depom" class="istyle" value="10" min="10" max="1000" step="0.01" onmousemove="getP()">
        
    <input readonly id="mmid" value="10">
        <select id="plane" onchange="getP()" value="15">
              <option value="15">option 1</option>
              <option value="18">option 2</option>
            <option value="24">option 3</option>
        </select>
            
    <input readonly id="total2" value="15">
    <input readonly id="total" value="18.00">
    <div id="ausgabe">
    
    </div>

JavaScript

getP = function() {
            var numVal1 = Number(document.getElementById("depom").value);
            var numVal2 = Number(document.getElementById("plane").value);
            
            var totalValue3 = numVal1
            document.getElementById("mmid").value = totalValue3.toFixed(2);            
            var totalValue2 = numVal2
            document.getElementById("total2").value = totalValue2.toFixed();
            var totalValue = (numVal1 / 100) * numVal2 * 12
            document.getElementById("total").value = totalValue.toFixed(2);
           
            
        
             document.getElementById("ausgabe").innerHTML = "<p>Dies ist die Totalvalue: "+ totalValue + "</p>";
            if (numVal2 === 15){
            vchild = document.getElementById("depom").value = "10"
            minchild = document.getElementById("depom").min = "10"
            maxchild = document.getElementById("depom").max = "1000"
            }
            if (numVal2 === 18 ){
            vhous = document.getElementById("depom").value = "1000"
            minhous = document.getElementById("depom").min = "1000"
            maxhous = document.getElementById("depom").max = "10000"
            }
            if (numVal2 === 24){
            vexp = document.getElementById("depom").value = "10000"
            minexp = document.getElementById("depom").min = "10000"
            maxexp = document.getElementById("depom").max = "100000"
            
            }            
            }