<meta charset="UTF-8">
<script>
document.write("Eu acertei: " + 15/50*100 + "%" );
</script>
<br>
<br>
<script>
document.write("Eu acertei: ");
document.write("<br>")
document.write( 15/50*100 + "%");
</script>
<br>
<br>
<script>
document.write("Eu acertei: " + "<br>" + 15/50*100 + "%")
</script>