ENGCOM-5066: Tierprice can t save float percentage value 18651 #19584

 - Merge Pull Request #19584 from novikor/magento2:Tierprice-can-t-save-float-percentage-value-18651
 - Merged commits:
   1. 4f318e5
   2. 5044da1
   3. c4c76d1

Author: magento-engcom-team

app/code/Magento/Catalog/Pricing/Render/PriceBox.php

@@ -3,6 +3,8 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento\Catalog\Pricing\Render;
 
 use Magento\Catalog\Model\Product;
@@ -71,7 +73,9 @@ public function jsonEncode($valueToEncode)
      *
      * @param int $length
      * @param string|null $chars
+     *
      * @return string
+     * @throws \Magento\Framework\Exception\LocalizedException
      */
     public function getRandomString($length, $chars = null)
     {
@@ -93,4 +97,21 @@ public function getCanDisplayQty(Product $product)
         }
         return true;
     }
+
+    /**
+     * Format percent
+     *
+     * @param float $percent
+     *
+     * @return string
+     */
+    public function formatPercent(float $percent): string
+    {
+        /*First rtrim - trim zeros. So, 10.00 -> 10.*/
+        /*Second rtrim - trim dot. So, 10. -> 10*/
+        return rtrim(
+            rtrim(number_format($percent, 2), '0'),
+            '.'
+        );
+    }
 }

app/code/Magento/Catalog/view/base/templates/product/price/tier_prices.phtml

@@ -77,7 +77,7 @@ $product = $block->getSaleableItem();
                             $price['price_qty'],
                             $priceAmountBlock,
                             $index,
-                            $tierPriceModel->getSavePercent($price['price'])
+                            $block->formatPercent($price['percentage_value'] ?? $tierPriceModel->getSavePercent($price['price']))
                         )
                         : __('Buy %1 for %2 each', $price['price_qty'], $priceAmountBlock);
                 ?>