title: How to use float numbers on BusyBox?
body: <p>I have a little computer with BusyBox, and compiling anything on it is a nightmare.</p>
  
  <p>I want to do something simple like "0,5*2", but can't without additional software.</p>
  
  <p>I tried "expr", "let", and just can't do any operation with float numbers.</p>
  
  <p>Is there anything I can do?</p>