Where is the business logic in MVP design pattern?

I am trying to understand how the MVP pattern works using a simple example.

I want to show the box content when the user clicks a button.

function reveal(number){
  let content;
  if(number==1) content = "candy"
  else if(number==2) content = "chicken"
  else content = "pencil"
  document.getElementById("box").innerHTML = "It's a " + content
}

<button onclick="reveal(1)"> box 1</button>
<button onclick="reveal(2)"> box 2</button>
<button onclick="reveal(3)"> box 3</button><br>
<h3 id="box"> </h3>

YES, I do know it is not the best idea to use such a complicated pattern for this snippet code. I just think this example would be really easy to understand.

Now my questions:

1. Should I put the logic (if...elseif..) in the presenter or in the model?
2. For Question 1, If I put the logic in the presenter, does that mean that the model will be useless?