WooCommerce - Show discount on single product page

// This code works fine for single products.
function my_custom_wc_single_price_discount() {
    global $product;

    $discount  = 10; // 10% off
    $price     = $product->get_price();
    $new_price = $price - ( $product->get_price() / 100 ) * $discount;

    echo '<p>' . sprintf( __( '<strong>%s</strong> (%s de desconto) no boleto bancário.' ), wc_price( $new_price ), $discount . '%' ) . '</p>';
}

add_action( 'woocommerce_single_product_summary', 'my_custom_wc_single_price_discount', 11 );