<button id="btn"> Play the Dinner Game </button>

<p id="para"></p>



document.getElementById("btn").addEventListener("click", dinnerThing);



function dinnerThing () {
        var cost = prompt("how much did it cost?");

        if(cost == "") {
            document.getElementById("para").innerHTML = "sorry please enter an integer";
        }

        var taxRate = prompt("What was the tax rate?");

        if(taxRate == "") {
            document.getElementById("para").innerHTML = "sorry please enter an integer";
        }



        var taxPaid = cost * taxRate;


        document.getElementById("para").innerHTML = "You paid " + taxPaid + " dollars in tax for your dinner";
}