A discount series of 10% , 20% and 40% is equal to a single discount of:

 a) 50%
 b) 56.8%
 c) 60%
 d) 60.28%
SSC CHSL-2015

56.8.
Solution
First discount is 10% and 2nd discount is 20% then ,
Total discount of first two discounts = ( 10 + 20 - 10 x 20 / 100 ) %
= ( 30 – 200 /100 ) % = 28%
Third discount = 40%
Total discount = ( 28 + 40 - 28 x 40 /100 )%
= 56.8%
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