WP_Query com múltiplos meta_query

query.php

<?php

$paged   = (get_query_var('paged')) ? get_query_var('paged') : 1;
$roi_min = (get_query_var('roi_min')) ? intval( get_query_var('roi_min') ) : false;
$roi_max = (get_query_var('roi_max')) ? intval( get_query_var('roi_max') ) : false;

$args = array(
	'post_type' 	 => 'post',
	'posts_per_page' => 10,
	'paged'     	 => $paged,
	'meta_query' 	 =>  array(
		'relation' 	=> 'AND',
		array(
			'key' 		=> 'roi_min',
			'value' 	=> $roi_min,
			'compare' 	=> '>=',
			'type'		=> 'NUMERIC'
		),
		array(
			'key' 		=> 'roi_max',
			'value' 	=> $roi_max,
			'compare' 	=> '<=',
			'type'		=> 'NUMERIC'
		)
	)
);

$reports = new WP_Query( $args );