Grouping on Scores

I have attached is a spreadsheet that has this
Column A Player
Column B Score
Column H&I Points earned

What I would like to do is this.

I need to organize column b into 5 groups based on their score. The lowest 10 scores would fall into group 5 and get 5 points, scores 11-20 would fall into group 4 and get 4 points and so on.

The catch is I don't want to reorganize column A or B

So In column C I would like to return the number of points received.

Is this possible?

Thanks