Talk:Tristana/@comment-99.122.40.53-20130315040837/@comment-4881935-20130315041826

here's two general rule of thumbs you can go by:
 * Debuffs don't stack unless they actually state that they stack.
 * When two percentage stacks with one another, they stack multiplicatively, not additionally.

So to answer your question, no, they do not stack. And even if the debuff could stack, the actual amount would be 75%.