Sonic Boom obtained a surround sound system for $$2400$ less $30\%$ and $15\%.$ The store$$s pricing

is based on overhead expenses of $40\%$ of cost$.$ The $$regular price$$ of the surround sound system

is set so that, if it is sold in a $20\%$ off$$ sale, the store$$s operating profit will be $25\%$ of cost$,$

a$.$What is the $$regular price$?$

b$.$In a Midnight Madness Special, the system was sold at a $1/3$ off$$ special price. What was theprofit or loss at the special price