I want to use this function variable sacopa
function show_selected() {
var selector = document.getElementById('id_of_select');
var copa = selector[selector.selectedIndex].value;
var sacopa = parseInt(copa);
};
on this other function
function shuma1() {
vlera1=0;
var x = document.getElementById('width').value / 100;
var z = document.getElementById('height').value /100;
var value1 = x*4*5;
var value2 = z*4*5;
var value3 = x*z
var vlera = value1 + value2 + 15 + value3 * 25 * sacopa;
document.getElementById('result').value = vlera.toFixed(1) + "€";
vlera1=vlera;
};