Answer: $70
Explanation:
1. Make an equation: since 100% price is equal to $350, you can make this ratio => 100:$350=80:$x
x stands for the cost after 20% discount.
2. Solve by cross multiply: 350*80=100x => 28000=100x => x=280
3. Subtract : to find the amount of discount, subtract the discounted price from the original price => 350-280=70
Have a nice day! :D