Sonic Boom Obtained a Sound System for $2,400 Less 30

Short Answer

Sonic Boom obtained a sound system for $2,400 less 30% and 15%. The system was originally priced so that, when sold in a "20% off" sale, the store's overhead and operating profit represent 25% and 15%, respectively, of the sale price. In a Midnight Madness Special, the system was sold at a " off" special price.
a) What was the original "regular price"?
b) What was the profit or loss at the special price?