Answer: Option 1 is cheaper by $4.50
Explanation:
Option 1 is calculated by taking the discount then adding on the shipping fee.
80 - (80 x 0.3) + 7.50
80 - 24 + 7.50
63.5
Option 2 is calculated just with a discount
80 - (80 x 0.15)
80 - 12
68
To see how much she saves, you can subtract:
68 - 63.5 = 4.5