var sizePrice = 5000;
var netIns = 500;
var bathCupPrice = 3000;
let roomSize = 0;


function getData(){

    for (i=0;i<document.getElementsByName("roomSize").length;i++){
        if (document.getElementsByName("roomSize")[i].checked == true){
            switch (document.getElementsByName("roomSize")[i].id){
                case "jeden":
                    roomSize = 100;
                    break;
                case "dwa":
                    roomSize = 200;
                    break;
                case "trzy":
                    roomSize = 300;
                    break;
            }
        }
    }

    let room = document.forms['foremka']['room'].value;
    let bathCup = document.forms['foremka']['bathCup'].checked;

    let summary = 0;
        summary += parseInt(roomSize * sizePrice) + parseInt(room * netIns);

    if (bathCup) summary += parseInt(bathCupPrice);

    document.getElementById("wynik").innerHTML="Koszt Mieszkania: "+summary;

}