Displaying the second price in custom fields

Hello, I would like to display the price in product page with separate field or custom code.I need to display a price like PRICE divided by 3 months, for example 30/3 and the text will pay per month only 10. I hope the logic is clear. Other plugins show either a percentage or a fixed amount, but I need a price from variable and simple products. I hope for your help and I apologize for my english.