Get price via ajax

Currently I have the below code but how can I make it get the variation,sale price or like it is now the normal price when a variation is selected?

Code:

    <div class="row">
    <div class="col-md-14" style="margin-top:50px;">
    <?php if($product->is_on_sale())
    		{
    			$price = $product->get_sale_price();
    		}else{
    			$price = $product->get_price();
    	}
    
    ?>
    <script async src="in=50&max=400&amount=<?php echo $price; ?>" type="application/javascript"></script>
    </div>
    </div>