Two shops sell the same refrigerator, marked at ₹32000 in both. Shop P offers successive discounts of 20% and 10%, while Shop Q offers successive discounts of 15% and 15%. A buyer who picks the cheaper shop saves how much (in ₹)?

Shop P: $32000\times 0.80\times 0.90=$ ₹23040. Shop Q: $32000\times 0.85\times 0.85=$ ₹23120. Shop P is cheaper by ₹80. (Both offers add up to 30% on paper, which is why the tempting answer is ₹0 — but successive discounts multiply, and $0.80\times 0.90=0.72$ is slightly smaller than $0.85\times 0.85=0.7225$. Splitting a discount evenly always leaves the buyer paying a little more.)