WooCommerce: Calculate Subtotal On Quantity Increment @ Single Product

/**
 * @snippet       Calculate Subtotal Based on Quantity - WooCommerce Single Product
 * @how-to        Get tutoraspire.com FREE
 * @author        Tutor Aspire
 * @compatible    WooCommerce 4.1
 * @donate $9     https://tutoraspire.com
 */

add_action( 'woocommerce_after_add_to_cart_button', 'tutoraspire_product_price_recalculate' );

function tutoraspire_product_price_recalculate() {
global $product;
echo '
Total: 
';
$price = $product->get_price();
$currency = get_woocommerce_currency_symbol();
wc_enqueue_js( "
$('[name=quantity]').on('input change', function() { 
var qty = $(this).val();
var price = '" . esc_js( $price ) . "';
var price_string = (price*qty).toFixed(2);
$('#subtot > span').html('" . esc_js( $currency ) . "'+price_string);
}).change();
" );
}