Yes I replaced too many lines the first time.

I tried to add the ea. after the price but I broke the cart with this code"

Code:
 
   $currencies->display_price($this->products[$i]['final_price'], $this->products[$i]['tax'], 1) . 'ea.' . . ' = ' . $currencies->display_price($this->products[$i]['final_price'], $this->products[$i]['tax'], $this->products[$i]['qty']) .
How do I need to change it to add ea.?

Thanks.