Different Price Selections

Hi, I wanted to create a membership sign up for with different pricing choices but the 'amount' doesn't change or add up when I selected more than one. How can I make it to work?

This is what I want:
The total Standard Package is $510 but if they choose one of the listed items, the price is $85 each. If they choose more than one items, it would be $85+$85 and etc. depending on how many items they selected.

jennyworkshop.com/index.php/component/pm...cols2lines&form_id=2







Please see my screenshot also.

Regards,
Karen