decimal-subscript.php

add_filter( 'formatted_woocommerce_price', 'ts_woo_decimal_price', 10, 5 );
function ts_woo_decimal_price( $formatted_price, $price, $decimal_places, $decimal_separator, $thousand_separator ) {
	$unit = number_format( intval( $price ), 0, $decimal_separator, $thousand_separator );
	$decimal = sprintf( '%02d', ( $price - intval( $price ) ) * 100 );
	return $unit . '<sub>' . $decimal . '</sub>';
}