If 10% discount and then 40% discount in succession is equivalent to total of:

 a) 40%
 b) 30 %
 c) 46%
 d) 50%
SSC CHSL-2015

46%.
Solution
If the first discount is x% and 2nd discount is y% then ,
Total discount = ( x + y - xy / 100 ) %
x = 10% and y = 40%
Total discount = [ 10 + 40 – ( 10 x 40) / 100] %
= ( 50 – 400 /100 ) %
Total discount = 46%
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