Comparing by meta_value

        $citySize =  array(
                    'key' => '_bm_min_city',
                    'value' => array(50000,100000),
                    'compare' => 'BETWEEN',
                    'type' => 'numeric'
                        );
        $investemntRange = array(
                    'key' => '_bm_start_costs',
                    'value' => 10000,
                    'compare' => '<',
                    'type' => 'numeric'
                        );

function bm_release_the_frannies($citySize, $investemntRange){
    global $post;
    $args = array(
                'post_type' => 'cpt_franchize',
                'meta_query' => array(
                    $citySize,
                    $investemntRange
                    )
                 );



    $results = new WP_Query($args);

    if ( $results->have_posts() ) : while ( $results->have_posts() ) : $results->the_post();

    $bm_cost_licens = get_post_meta($post->ID, '_bm_cost_licens', true);
    $bm_cost_venue = get_post_meta($post->ID, '_bm_cost_venue', true);
    $bm_cost_merchandise = get_post_meta($post->ID, '_bm_cost_merchandise', true);
    $bm_start_costs =  get_post_meta($post->ID, '_bm_start_costs', true);
    $bm_return_invest = get_post_meta($post->ID, '_bm_return_invest', true);

    ?>
    <article>
        <h2><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></h2>
        <p>Koszty startowy: <strong><?php echo $bm_start_costs; ?></strong></p>
        <ul>
            <li><?php if (! empty( $bm_cost_licens ) ) {echo $bm_cost_licens;} else { echo 'b.d.'; } ?></li>
            <li><?php if (! empty( $bm_cost_venue ) ) {echo $bm_cost_venue;} else { echo 'b.d.'; } ?></li>
            <li><?php if (! empty( $bm_cost_merchandise ) ) {echo $bm_cost_merchandise;} else { echo 'b.d.'; } ?></li>
        </ul>
        <p>Szacowany zwrot z inwestycji: <?php if (! empty( $bm_return_invest ) ) {echo $bm_return_invest;} else { echo 'b.d.'; } ?></p>
    </article>
    <?php

    endwhile;

    else:

        echo 'Brak rezultatów w podanym zakresie';

    endif;
}