A department store is having a sale and marks everything down 20%. You have a coupon for an extra 10% off. Because you are the 100th customer, you receive an extra 30% off! What percent do you save? What percent do you pay?

0.8*0.9*0.7 = u pay 50.4%

u save 1-50.4% = 49.6%

To find out what percent you save, we need to consider all the discounts you receive.

1. The department store marks everything down by 20%. This means you are saving 20% off the original price.
2. You have a coupon for an extra 10% off. After applying the coupon, you save an additional 10% off the discounted price.
3. Because you are the 100th customer, you receive an extra 30% off. This is an additional discount of 30% off the price after the previous two discounts.

To calculate the total percent you save, we add up the percentages of the individual discounts:

20% + 10% + 30% = 60%

So, you save a total of 60% off the original price.

To find out what percent you pay, we need to subtract the total percent you save from 100%:

100% - 60% = 40%

So, you pay 40% of the original price.

Therefore, you save 60% and pay 40% of the original price.