WooCommerce - Custom pricing.

functions.php

<?php
// Do NOT include the opening php tag.

// Set custom price.
function m3wc_woocommerce_product_get_price( $price, $product ) {

	// Do any calculations or conditions here.
	// For example1: Set a different price for each type of user.
	// For example2: $price = $price + ( $price * 0.09 ); Adding 9% of the price.

	return $price;
}
add_filter( 'woocommerce_product_get_price', 'm3wc_woocommerce_product_get_price', 10, 2 );