Solution
Let original price = $$100x$$
After 1st discount of 10% =>$$\frac{10}{100} * 100x = 10x$$
Price = $$100x-10x = 90x$$
After 2nd discount of 20% => $$\frac{20}{100} * 90x = 18x$$
Price will become = $$90x-18x = 72x$$
=> Equivalent Discount % = $$\frac{100x-72x}{100x}$$ * 100 = 28%
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