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Two successive discount of 10 and 20 are equivalent to a...

This question belongs to Arithmetic Ability Profit And Loss
Profit and Loss
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Two successive discount of 10% and 20% are equivalent to a single discount of:

Answer & Solution
Correct Answer: Option B
Use Formula,
Equivalent Discount = (A + B) - $$\frac{{{\text{AB}}}}{{100}}$$ where A = First Discount, B =Second Discount.
Equivalent Discount = (20 + 10) - $$\frac{{20 \times 10}}{{100}}$$
Equivalent Discount = 30 - 2 = 28%

Graphic Change Method
100 == 20%(disc.) ⇒ 80 == 10%(disc.) ⇒ 72
Equivalent discount = 28%
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1 Comment
Jerf Dcruz
Jerf Dcruz 3 years ago
Easy method -
x+y-xy/100
= 20+10-20*10/100
=30-2
=28
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