Calculate scaling prices PHP dont show up

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I'm trying to change the scaling prize on the reservation system on PHP. The part of the system was

<?php echo DateTime::secondsToInterval( 3600 * 2 ) ?>" data-text-1="<?php echo DateTime::secondsToInterval( 3600 * 2 ) ?> (<?php echo Price::format( 40 * 2 ) ?>)"></option>

The problem becomes when I try to change the price value <?php echo Price::format( 40 * 2 **- 190**) ?> The system still shows the same result with no change. I tried clear cache but still no result. Do you know, how i can't fix it? Can you help, please? Thank you Wish you a fantastic day :) Jana

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