Excel Macro checkboxes

I have this table

and, if possible using a macro, I want to:

1. when checking the box that has the value 30% it would copy to the 'Total selected" 30%

2. the user can only check one box

3. I just want when a user check the box to evaluate point1 he would choose one of the ratings (0%-30%-60%-100%) and whatever he choose will copy to the total weight value.

I don't know how to define a value for each box?