I created one group product. In this, I have added 3 simple products. Now, I want to add 10$ plus in all 3 products when add to the cart. How can I do that?

I used this event checkout_cart_product_add_after

But, It's only updated 1 product. How can I update all product prices?


namespace Vendor\Module\Observer;

use Magento\Framework\Event\ObserverInterface;
use Magento\Framework\App\RequestInterface;
use Magento\Framework\Event\Observer;
class UpdateAddToCart implements ObserverInterface
    public function execute(Observer $observer)
        /* Code here */
        $item = $observer->getEvent()->getData('quote_item');
        $item = ( $item->getParentItem() ? $item->getParentItem() : $item );
        $price = 100;

Please help me. Thanks.

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