Reto Refactorización WRP 36

product.php

<?php

class Product {
	
	// ... more code


	function amount() {

		$product_price = $this->quantity * $this->productPrice;

		$discountRate = 1;

		if($product_price > 1500) {
			$discountRate = 0.7;
		}
		else {
			$discountRate = 0.95;
		}

		return $product_price * $discountRate;
	}

	// ... more code
}