Change dropdown menu in front-end for user registration/enrollment with amount

One-sentence description

Display the price of membership type in the dropdown menu of front-end registration page.

Why?

People are lazy. They don't read the whole text and only fill in the form. They select 'study membership' and when they want to pay, they see it is more expensive. That's annoying because you have to change data afterwards (which can't be done a.t.m. after approval).

Current implementation

The dropdown menu only shows 'one year membership' and 'study membership'

Suggested implementation

The dropdown menu shows 'one year membership (€ 7,50)' and 'study membership (€ 30,00)'