Percent equation math question, can someone please help me out here??? Thanks?

In your own words, how would you explain how to solve a percent equation, using this given example below:
Last week, I was having a 15%-off sale on all Piranha II (80% Tungsten) soft tip darts. Out of the 42 sets of the Piranha II darts I had in stock, I sold 27 sets.
If thid would [...]

HELP!!!! piranhas!!!!!!?

anyone that’s experienced i would greatly appreciate it. I’ve done lots of research before buying the piranhas, and the people at the pet store have bout as much knowledge as i do and only seem to follow the directions of their boss (who’s never around!!!! when i try to ask questions) and there isn’t alot [...]