The sign at Herberger's entrance on Thursday said "Last 12 days," which means the stores are likely closing around Aug. 26Â or so. Nearly everything is now 70 to 90% off with an extra 10, 20 or 30 percent discount.Â

So does that mean that a sweater marked 90% off plus an additional 10% off is free? Unfortunately, no.

Some bargain hunters may not be aware that additionalÂ discounts cannot be added together. For example, if a \$100 sweater is discounted 90%, the new price is \$10. The additional 10% discount is deducted from the \$10 subtotal, which is \$1. So a \$100 item marked down 90% and 10% would costÂ \$9.

RetailersÂ use Americans' fuzzy math to make a deal seemÂ better than it is.Â A BOGO or "buy-one-get-one" offerÂ is a good example of that. Initially, a BOGO usually meant that a consumer bought one item and got an identicalÂ second one free, a 50% savings. Then it began to change toÂ "buy one and get another at 50% off." Â To some, thatÂ may sound like getting 50% off if two items are purchased. It's actually 25% off each because the first item is sold at fullÂ price andÂ the second item is 50% off.Â

For example, say a \$10 bottle of detergent is on a 50% off BOGO. The first bottle is at \$10 (regular price) and the second bottle is \$5 (50% off \$10). The total for both is \$15 on a BOGO sale,Â regularly \$20. That's only a 25% discount (\$5)Â on the two bottlesÂ (\$20 X .25= \$5).

Why do retailers like BOGOs? They want shoppers to buy more. Many, but not all, consumers realize that when ad says "10 ears of corn for \$1," the consumer is not required to buy 10 ears unless stated in the ad. Whether a shopper buys two ears or more, they are still 10 cents each. But when an item is on a BOGO sale, the consumer is required to buy multiplesÂ to get the discount.Â

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