I have a problem with the function part of my code giving me a visual response

function displayOutput(massage){
    const element = document.getElementById("jsoutput4");
    element.innerHTML = massage;
}
function calculateF(A, B, C){
    var D = B = A;
    var E = D * 5;
    var F = E * C;
    return D
}
var G = calculateF(100, 20, 10);
displayOutput("your answer is" + calculateA);

<p id="jsoutput"></p>

function displayOutput(massage){
    const element = document.getElementById("jsoutput");
    element.innerHTML = massage;
}
function calculateF(A, B, C){
    var D = B = A;
    var E = D * 5;
    var F = E * C;
    return F
}
var G = calculateF(100, 20, 10);
displayOutput("your answer is " + G);

<p id="jsoutput"></p>