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<?php
// Add R xx.xx per KG
add_action( 'woocommerce_price_html', 'wc_custom_price', 10, 2 );
function wc_custom_price( $price, $product ) {
	return sprintf( __( '%s per KG', 'woocommerce' ), woocommerce_price( $product->get_price() ) );
}
?>