A discount of 20% on an order of goods followed by a discount of 10%

Question

A discount of 20% on an order of goods followed by a discount of 10% amounts to

(A) less than one 15% discount
(B) the same as one 15% discount
(C) the same as one 30% discount
(D) less than a discount of 10% followed by a discount of 20%
(E) the same as a discount of 10% followed by a discount of 20%

Abhishek009 · Answer

-20 - 10 + \frac{(-20)(-10)}{100} = -30 + 2 => -28 , Check the options carefully , non except (E) is possible, Answer must be (E)

nikiki · Answer

the final price will remain the same regardless of whether you apply discount 10 first or discount 20 first followed by the other

========
Example
========
Lets take the price to be 100

Price =  100 
after 20% discount
Price =  80 
after 10% discount
Price =  72

Option A and B
15% discount would be 75
Eliminated

Option C
30% discount would be 70
Eliminated

Option D
10% followed by 20% gives the same number of 72
Eliminated

Option E is correct

saynchalk · Answer

Discount of 10% makes the value 0.9x and discount of 20% on 0.9x makes it 0.8(0.9)x = 0.72x, so the discount is 28%. Concept will help a lot.

A discount of 20% on an order of goods followed by a discount of 10%

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A discount of 20% on an order of goods followed by a discount of 10%

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