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<?php
// Place in your theme's functions.php file
// Revert grouped product prices to WooCommerce 2.0 format
add_filter( 'woocommerce_grouped_price_html', 'wc_wc20_grouped_price_format', 10, 2 );
function wc_wc20_grouped_price_format( $price, $product ) {
	$tax_display_mode = get_option( 'woocommerce_tax_display_shop' );
	$child_prices     = array();

	foreach ( $product->get_children() as $child_id ) {
		$child_prices[] = get_post_meta( $child_id, '_price', true );
	}

	$child_prices     = array_unique( $child_prices );
	$get_price_method = 'get_price_' . $tax_display_mode . 'uding_tax';

	if ( ! empty( $child_prices ) ) {
		$min_price = min( $child_prices );
		$max_price = max( $child_prices );
	} else {
		$min_price = '';
		$max_price = '';
	}

	if ( $min_price == $max_price ) {
		$display_price = wc_price( $product->$get_price_method( 1, $min_price ) );
	} else {
		$from          = wc_price( $product->$get_price_method( 1, $min_price ) );
		$display_price = sprintf( __( 'From: %1$s', 'woocommerce' ), $from );
	}
	return $display_price;
}