What is the proper way to display none for the else statement in functions.php on wordpress?

Got some help to show this particular hook on the product page on woo commerce. this displays a particular amount when the price is > 20000

and i need to display none when the price is < 20000

Just wanted to know is this the proper way to use else statement.

add_action( 'woocommerce_single_product_summary', 'show_inst_price', 30 );
  function show_inst_price() {
   global $product; 
   $id = $product->get_id();
    $product = wc_get_product( $id );
    if( $a > 20000 ){
    $b  = 5.15464;
    $c = 100;
    $d = $a * $b;
    $total = $d/$c;
      echo '<div class="inst-price" style="font-weight:bold; margin-top: -15px; margin-bottom: 15px;">0% Instalments starting from <span style="color:red;">Rs. ' . number_format($total) . '/month</span></div>';
      echo '<span></span>';

Still the code works perfectly.