DVD Players
In an electronics store, a DVD player costs $ 60. In a day were sold some of this DVD player and the profit was dollars. The next day a sale reduced the price of the DVD player to $ 40. That day were sold 4 DVD players more than the day before, but the profit was the same on both days. How many DVD players were sold on these two days?
The answer is 20.
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1 solution
Let the number of DVDs sold is 'y' Day 1: Cost of 1 CD=60 So total selling=y 60 And profit be 'x'.so on selling those DVDs we got y 60=x
Day 2: Cost of 1 CD=40 Selling=(y+4)40 and the profit be same so, (y+4)40=x
Equate the both equations on LHS, Y*60=(y+4)60 Y=8; So on day1=8, day 2=8+4 Total=20