Two successive discount of 20% and 10% is equivalent to single discount to what percent?

Question: Two successive discount of 20% and 10% is equivalent to single discount to what percent?

• 20%
• 28%
• 30%
• 54%

Answer: 

$$D=x+y-\frac{xy}{100}$$

• $x = 20\%$

• $y = 10\%$

$$D = 20 + 10 - \frac{20 \times 10}{100}$$ $$D = 30 - 2$$ $$D = 28\%$$

 equivalent single discount is 28%.

Detail Solution:

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