How can we show the sale price and original price in the order/invoice section?

Hello there everyone, hope you all are doing well!

Just had a question in regards to the original price and sale price inputs.

For example, if we put the original price as $100 and the sale price as $90.

How can we get this to show on the:

1. Order emails sent by WooCommerce to the store owner and the customer.
2. The backend of WooCommerece where we can see the orders and other details.
3. The invoices/packing slips.

Thanks for any help you can provide ?