When doing inequalities, when would i know when to switch the sign/symbol (by symbols i mean; < and > )

Can you answer my question? will mark brainiest!

Which expressions are equivalent to k/2 choose 2 answers: a k-2 b 2/k c 1/2k d k/2 e k+k

Astore has clearance items that have been marked down by 60%. they are having a sale, advertising an additional 55% off clearance items. what percent of the original price do you end up paying?