Answer:
C. $56
Explanation:
We have been given that a DVD player with a list price of $100 is marked down 30%.
Let us find the price of DVD player after marked down by figuring out 70% (100-30) of $100.

Therefore, the price of DVD player after marking down by 30% will be $70.
As John gets an employee discount of 20% off the sale price, so to find the amount paid by John we need to figure out 80% (100%-20%) of $70.



Therefore, John paid $56 for the DVD player and option C is the correct choice.