Dear samueljeden,
Your solution worked perfectly!
I am deeply grateful.
A tip for anyone reading this thread in the future:
When upgrading Woocommerce, the file will be replaced by the original prices.php, undoing the changes.
To ensure that does not happen, instead of directly changing the "prices.php", create a folder in your theme called "woocommerce", and inside another folder called "single-product", in this folder create a file "prices.php" with content provided by samueljeden.
Hugs.