Answer:
Mary is incorrect
Explanation:
Mary is incorrect
The additional reduction of 30% is not on the original normal price but the original price discounted by 20 % originally
The total discount will be less than 50%, actually 44%
To prove Mary is wrong, let's take the normal price of the TV as $100
After discount of 20% which is a discount of 0.20 x 100 or $20, the reduced price is $100-$20 = $80
The additional reduction is on this price so the additional discount = 30% of $80 = 0.3 x 80 = $24
The final price of the TV is $80 - $24 = $56
The total discount = 100 - 56 = 44
Percent discount = Discount amount/Original Price x 100
= 44/100 x 100 = 44%