Two successive discounts of 40% and 60% on a deal are equivalent to a single discount of :

Correct option is C

Given:

Two successive discounts of 40% and 60% 

Formula Used:

​$$-a -b + \frac{-a\times -b}{100}$$ 

Solution:  

a = 40% , b = 60% 

= $$-40 - 60 + \frac{- 40\times - 60}{100}$$  

=  -100% + 24%

= -76% 

Equivalent discount = - 76% ​