Question

A single discount equal to a discount series of 10% and 20% is

• A. 25%
• B. 30%
• C. 35%
• D. 28%

Answer 1

The correct option is D 28%

$100\times \frac{100-10}{100}\times \frac{100-20}{100}$

= $100\times \frac{90}{100}\times \frac{80}{100}=72$

$\therefore$ Single discount $=100-72=28\%$