Lets day the original price of the dvd player was $100, 36% marked down means you pay $64x 64x = $41.60 100x = 100/54 x 41.60 = 4160/64 = #65.00 = original cost similarly, stereo tuners = 100/78 x 69.42 = 6942/78 = $89 original cost DVD = 65- 41.60 = $ 23. 40 less Stereo = 89- 69.42 = $ 19.58 less Diffrence is $ 3.82 so your answer is the dvd player price was reduced by $3.82 more than the stereo tuner.
