How do I make it so when my money is at a certain value, a button appears

I tried and tried and don’t understand. I’m new to this, I learn by people doing it for me (I know… it’s weird, but I study what they do, make sure I understand completely, and then implement it into my code and other projects). But y’all do not have to do it for me, though would be greatly appreciated. I need it so when my money reaches 200 a button appears.

Here’s the fiddle
jsfiddle.net/Weston1256/e5j4p8uw/81/embed/

I tried

function firstItemFunction() {
var num = document.getElementById(“score”);
num.firstItem(1);
store.set(‘putAKeyHere’, num.value);
if (num.value >= 200)
}

Which didn’t seem to work but it would be appreciated as I have to make a game for school that represents capitalism) any help is greatly appreciated!