Advertisement A: Take $20 off the regular price of $100. Buy before Friday to take 40% off the sale price.
If you buy the item before friday then the sale price will be:
Therefore, for advertisement A you will save $40.
Advertisement B: Take 40% off the regular price of $100. Use your coupon to take an additional $20 off the sale price.
If you buy the item using the coupon, then:
The sale price will be $40, therefore, for advertisement B you will save $60.
Answer:
Advertisement B offers more savings