Sonic Boom obtained a stereo 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 stereo 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 the profit or loss at the special price?

2400(1- 0.30)(1- 0.15) = 1428

S = S ( reduced ) + D

S = 1428 + 0.20s + 0.25s

S – 0.45s = 1428

55s = 1428

S = 2596.36

WRONG

Correct answer for a

2945.25

where did i go wrong ?