Excel frustration with multiple IF statements

[digitalmind1021]

Excel is one of those things where I really hate having to figure out complex formulas. Anyways... I'm struggling with the following formula.

(see attachment since this page's Sucuri wouldn't let me post with it....

What I need this formula to do is Check a number (B21) against 6 different ranges of numbers. Then if B21 is between a particular range it then needs to multiply B21 by another cell that is matched with that range IE C3, D3,E3,F3,G3 or H3. Maybe I'm over complicating this but I've been grinding at this for hours now, tried various different formulas and I can't seem to figure it out. Hence I'm reaching out to the world since there are without a doubt smarter people out there than me at this.

Thanks in advance.

DM