Discount calculate in laravel

  <td>

            @if($item->discount_price == NULL)

            <span class="badge badge-pill badge-danger">No Discount</span>

            @else

            @php

            $amount = $item->selling_price - $item->discount_price;

            $discount = ($amount/$item->selling_price) * 100;

            @endphp

          <span class="badge badge-pill badge-danger">{{ round($discount)  }} %</span>

            @endif

        </td>