If an item is given two successive discounts of 10% and 15%, what is the total effective discount?

Answer: 23.5%
Explanation

The total discount is not simply added. Use the formula:
Effective discount =a + b - frac{ab}{100}

10 + 15 - frac{10 times 15}{100} = 25 - 1.5 = 23.5%

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