Increase loop value by decimal point number

decimal_number_loop.php

<?php
    if (is_array( $faqs )) {
    $i = 0.2;
    foreach ( $faqs as $faq ) {
        ?>
        <div class="col-xs-12 col-sm-6">
            <div class="single-faq wow fadeInUp" data-wow-delay="<?php echo $i ?>s">
                <h5 class="title"><?php echo esc_html($faq['title']) ?></h5>
                <p> <?php echo wp_kses_post($faq['description']) ?> </p>
            </div>
        </div>
        <?php
    $i = $i + 0.2;
    }}