title: Problems with the calculation JavaScript
body: <p>test there in their consoles browser</p>
  
  <p>1067.11-1000 = 67.1099999999999</p>
  
  <p>but the correct thing 67.11</p>
  
  <p>can even test the calculator windows ..</p>
  
  <p>could someone explain this to me?</p>