Answer: Mary's backpack was a better buy.
Step-by-step explanation:
First, you figure out the cost of Mary's backpack. To do this, you find the amount taken off the original price by doing 65 x 25%.
65 x 25% = 16.25. This is the price deducted form the original. Therefore the new price is $48.75 because $65(original)- $16.25(amount taken off original)= $48.75.
Now onto Roberto. First, you find the price taken off by doing 75 x 30%. This gets you $22. 50.
75 x 30%= 22.5
Next, you deduct the original from the amount taken off.
75-22.5= $52.50
Since 48.75 is less than 52.50, Mary's backpack was a better buy.
