How to trim zeros from round decimal prices in WooCommerce. See https://hookturn.io/remove-trailing-zeros-woocommerce-prices/

woocommerce-trim-zeros-from-price.php

<?php

// Need to trim zeros from a price on the fly? 
$price = 49.00; // Can be numeric or a string.
$price = wc_trim_zeros( $price ); // === '49'

woocommerce-trim-zeros.php

<?php

// If a WooCommerce price is a full dollar value, trim the 
// decimal & any trailing zeros. 
// e.g; $49.00 will display as just $49
add_filter( 'woocommerce_price_trim_zeros', '__return_true' );