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<!DOCTYPE html>
<html>
<body>

<p id="demo"></p>

<script>
document.getElementById("demo").innerHTML = myFunction(55);
function myFunction(a) {
var power = 10
return a * power
}
</script>

</body>
</html>

<!DOCTYPE html>
<html>
<body>

<p id="demo"></p>

<script>
document.getElementById("demo").innerHTML = myFunction(55);
function myFunction(a) {
    var power = 10
    return a * power
}
</script>

</body>
</html>