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Evaluate final net retail prices, total cash savings, and the compounding reality of stacked checkout promotions.
When retailers offer a primary promotion followed by an additional checkout coupon (e.g. "Take 30% off, plus an extra 20% at checkout"), the discounts do not aggregate to 50%. The second discount is calculated exclusively against the intermediate discounted price:
Retail psychology exploits the human tendency to add percentages. If an item listed at $100 has a 40% discount, the price drops to $60. If you apply an additional 20% discount code, that 20% is subtracted from $60 ($12 discount), yielding a final price of $48. You received an effective 52% total discount, not 60%.